Here's what's been fixed and what still broken in Windows 10 Mobile build 10581

Today's release by Microsoft of Windows 10 Mobile build 10581 to Windows Insiders doesn't have any new features, but it does fix a number of bugs compared to previous versions. The biggest fix is that older builds can directly update to build 10581, rather than the user having to downgrade their phone back down to Windows Phone 8.1.

Here's what's been fixed, according to Windows Insider head Gabriel Aul:

  • For devices upgraded from Windows Phone 8.1 like the Lumia 930, Lumia Icon, and Lumia 1520 that had the "Hey Cortana" feature – with this build "Hey Cortana" should work again in Windows 10. To make sure it's turned on, just go to Settings > Extras > Hey Cortana.
  • You can now select photos for sharing through third party apps like Facebook, Facebook Messenger, Instagram Beta, WhatsApp etc.
  • Battery life should be improved in this build. We fixed several bugs impacting battery life.
  • We fixed an issue where you couldn't choose some apps to show quick status on the Lock screen via Settings > Personalization > Lock screen.
  • We've made improvements to text prediction and auto-correction.
  • Video recording functionality has been improved.
  • Visual Voicemail sync should now work properly.
  • We fixed the dual-SIM issues that appeared in Build 10572.
  • We fixed the issue found with Build 10572 where the Chinese Pinyin QWERTY keyboard stopped working after upgrading from Windows Phone 8.1 that our Chinese Windows Insiders reported.

Here's what's still broken with Windows 10 Mobile build 10581, according to Aul:

  • As with previous builds, after applying this update the device may appear at a black screen for about 5 minutes when transition between the spinning gears and the final stages of update. Just be patient and it should progress past it. Exact time will vary by device.
  • You will be unable to set your default save locations via Settings > System > Storage and will not correctly reflect the current storage settings. If you are using a SD card in your phone, it will show up as a garbled name in Storage settings. Whatever you had configured for your save locations in the previous build will be the same.
  • After moving some apps to a SD card, those apps might crash. The workaround is to reboot your phone and those apps should work fine thereafter.
  • Deploying Silverlight apps through Visual Studio to your phone won't work in this build. You can deploy UWP apps to your phone without any issues.
  • If you restore a backup from a phone that had a different resolution, you may end up with a corrupted Start experience. The workaround is to go to Action Center (which won't be corrupted) then Settings > Personalization > Start and apply a different background picture.

Microsoft has more information on the default save locations issue for the phone's storage and SD cards in build 10581 in a message board post (opens in new tab).

Source: Microsoft

  • No deal breaking bugs! Good!!
  • The battery fixes sound like what I needed.  I flashed and rolled back because of Battery life on the last build. Looking forward to trying this again on my primary phone.
  • Battery life on my 1020 was supurb from the last build after a reset/no restore. Could easily go a full 24 hours of regular use
  • +1 on 1520
  • Not my experience. My 920 would go dead after about 6 hours with minimal activity. Glad they got this fixed!
  • my 1020 experience of last build was horrible. It took 10-12 hours to fully charge the battery but it drained in like 5-6 hours. This one seems better. Hoping for better.
  • Battery life had been great for me, but in the last day or two my 640XL has been getting warm and battery life was dropping like a stone. 
  • Well, on my 640 my start screen is useless, a jumbled, chaotic mess that looks like it passed amateur hour in the testing dept at MS. I wish I could attach an image.
    640 att version. Build 10581 installed today.
  • Same here, on a 1520. Go in the settings and disable the background picture and it should be back to normal. It will happen again everytime you put a background picture though.
  • Although that storage thing is weird...SD card support has always felt wishy-washy =s
  • My Photos App not showing pictures from SD card. What to do?
  • Reboot and try again.
  • SD card support has always been the best in 8.1 in my experience. However, it has had a lot of issues in 10.
  • "No deal breaking bugs! Good!!" -- That is entirely a matter of opinion. The storage issue is a pretty big deal for me on my Lumia 1520. :) That said, go install the build and I wish you the best of luck with it! I won't touch it since I cannot make proper use of my SD card.
  • I'm with you on this. This storage thing is pretty big issue for me. All my apps are saved on phone mem while photos, music and the like go to the sdcard. Not being able to control this a deal breaker for me. I guess my L1520 will have to stay on vanilla wp8.1 for a little longer. Waiting for the next build to see if I finally take the plunge.
  • Not really in my case. I have a 640 XL. I already see some apps not working great with SD card on WP8.1. With known issues listed in that category, I will stay on 8.1 until SD card support is equal or better than WP8.1
  • Is astoria still working?
  • I still cant believe that photos isn't fixed (pinch to zoom is wonky and difficult) and the loading screens.... they're still all over the place.
  • Yeah, this build is pretty A-Ok.  Experience keeps getting better and better. This is, of course, awesome!
  • This news is not exciting for that "we 're doing something that we've never done before".
  • PC and mobile builds on same day
  • Hardly exciting
  • I guess...if you're jaded... =\
  • Speak for yourself! I found this to be extremely exciting! 2x excitement!
  • "Releasing Builds for both PC n Mobile" is they have not done before. You shouldn't have expected too much.
  • winbeta has confirmed that pushing new mobile and pc build on the same day is "what they have never done"
  • Any info?
  • It's the first time they are releasing both mobile and PC build at the same day
  • :-| really that's it?
  • Welp. If that's what they were alluding to then meh! The WC article had my hopes up a bit.
  • You know, it IS possible to be excited by nothing at, "OMG, there's so much news happening right now after my lunch!" "WOW, I really suck at FPS multiplayer!" and this perennial, "Seems Faster!" =D
  • Feeling sorry for those who had expected new features when WC had reported about Aul's tweet.
  • In fairness to those that were let down, the WC article reported on what the build "will have" and asked for predictions on a feature. I think those that read the tweet more may have been less optimistic.
  • And yet the tweet didn't say any thing about features
  • There is a new PC build today too?
  • Yes, read the previous article!
  • Lesson of the day: don't get excited for anything. That way if anything exciting does happen it will he worth be excited for. He could've just told us this yesterday instead of teasing Posted via the Windows Central App for Android
  • I am being 100% honest when I say that this is what I actually guessed he meant when he said that. He said we're doing something different, it didn't sound like it had anything to do with the build, which by the way, is pretty excellent in its own right. What else could it have been? I didn't read the WC article but I can only imagine it way overhyped it or something.
  • The ability to install an Android ROM would justify that phrase, bug fixing or releasing mobile and desktop versions on the same day, is just.....well, its just another MS deception.
  • Lol wasn't w10/xb1 supposed to have the ability to patch while talking to tech support?
  • Nice.  Thanks.   Don
  • Not quite RTM ready yet, but this is the closest build yet! Will be updating as soon as possible.
  • 85%...
  • I would say probably closer to 90 or 95%. Not perfect, but the issues introduced are mostly centered around dual SIM and SD card usage, which is much more minor than previous issues. 
  • Was at 85% of the installation but fully agree the OS is between 90~95% ready. :) 
  • but it is close to RTM and probably internally already it is .. 
  • Not bad at all
  • new lumias should be out at the end of november. So should be really close to RTM now, don't know how long can they still tinker with it, 2 weeks ?  
  • Phones (And hardware in general these days) frequently have a "release day" update. So, technically they can keep refining for final release up until release week. 
  • microsoft developers are probably working on a build that is far ahead of what we have now - since they have branched codes, probably with more features and new things which MS does not want to make public now. We may suddenly see an amazingly polished build one week - at least that is what I am hoping!
  • W10M has been feature complete for months now.
  • Well, depends on your definition. E.g the previous build did add things that most would consider (small) new features. Posted via the Windows Central App for Android
  • No they are not. Windows Mobile 10 is going to be just the same damp squib we have already had to endure.
  • Basic features that existed in WP7 and WP8 would be nice. No need to hide that stuff in branches.
  • Such as?
  • Such as Cortana announcing the arrival of messages and asking if you want her to read it and after reading asking if you want to reply. Then allowing you to reply by speaking the message rather than having type.  This is the one thing that prevents me from moving fron 8.1 to 10.    
  • Some issues are 'updating' related.
  • What's the big thing everyone was talking about yesterday?
  • Nothing exciting, as expected. They are just putting some stress on their servers by releasing the non-mobile version too today...meh...
  • PC and mobile build updated on same day
  • I wiil try it to my Limia 820... 
  • I think you should try it I have l820 and it works just fine
  • Just installed 10572 today on mine, so this build will go in tomorrow :) If new build does not make sd card visible in storage settings, I may have to hard reset the phone. Bummer.
  • Apps on SD came back :) Storage shows combined used and free capacity, but list of places to save apps and images is empty. Let's see where pictures go :) Just when I "found" weather on lockscreen (and glance) as nice feature on 8.1, it's not working for me on insider. Oh well, looks good anyway ;)
  • Not many major issues. Looks good on performance edging closer to RTM.
  • What's that "never done before" thing stated by Gabriel Aul yesterday?
  • I think releasing both mobile and pc build on same day.. But I thought some new feature for phone build -.-
  • Hahaha, that's not unique thing. Let's wait if someone has that "never done before" thing.
  • They didn't say that NO ONE has done. They said THEY haven't.
  • So the I3unny is right, mobile and pc build same day. Gabriel tweeted
  • Can anybody tell me that the wifi connecting issue has been fixed or not? And anybody had installed it on Lumia 525?
  • It's just released wait for sometime for people to respond.. Use the forums there will be a lot of discussion :)
  • Would like to know if WiFi is working on the 630 dual sim?
  • Yeah! Party!
  • Looking good, less and less bugs now.
  • so, safe to assume 1-2 more builds before the 950's drop and then a couple of more before 8.1 devices start recieving updates?
  • They said they would roll it out for existing devices starting in December. (The exact date depends on the specific model and carrier, of course, so most probably sometime in 2016 for the majority of people)
  • If you're waiting for your carrier to make the approval, all guessing goes out the Window. Posted via the Note 4/Nexus 7 (2013)/Lumia 1020/Lumia 2520
  • My Blu Win HD is updating as well - is this expected?
  • Update for what?
  • win 10 mobile build 10581 i assume
  • Impossible. Probably gdr2
  • no, this device previously got updated to 10536 due to errors in the insider preview detection. There was no way to downgrade back to 8.1 without appropriate images from Blu. As such, it remains at 10536 until some "future date" EDIT: the update finished and appears to only be changes to the preview installer :(
  • :( this is blue fault, not Microsoft. They need to provide a way to roll back to 8.1
  • my acer m220 is stuck there too..
  • It would say under updates what's downloading.
  • Huh? To windows 10??
  • ? Are you sure? Hey windows central investigate!!!!!
  • Don't do it. Maybe there's a detectoid bug problem again, you have to flash your phone then!
  • except there is no 8.1 flash available from Blu for it...
  • Gabe has said this should only be compatible for Lumias and HTC One M8. Blue Win HD may have some problems and could brick your phone. You may be safe, but no guarantee.
  • So, should I wait or just go ahead and upgrade?! Noting new and the storage problem may bother me.
  • According to me you can upgrade for this build..
    & Presently I've 10572 in my L730 which works smoothly with very less number of issues..
    & while coming for storage issue..
    The download size may be 500 - 800 Mb which depends upon devices..
    [ Actually 777 Mb for L 730 ]
  • Oh no man. You took the wrong meaning. Storage problem refers to the Storage settings issue mentioned in the article. The download size won't have bothered me even if it had been more a GB.
  • Oh ok..
    Then don't perform a hard reset after update..
    Select the Default Storage location you prefer in the present build before installing 10581 you'll be safe..
  • Hey Cortana , remind me to update my phone when I get home
  • Productive like a boss.
  • a Chief...
  • really sweet !
  • Don't see the option for Hey Cortana in my extra settings on my 1520. Guess I will never get her back.
  • But is MixRadio available in the store?
  • Perform Hard reset after upgrading..
    Mix radio will be installed automatically by default..
  • Careful with that. In this build a hard reset van mess with your ability to save to SD card
  • No, unless it's available in the store to download, and I have a Lumia 920 so there is no SD card :/
  • To get apps that were listed in 8.1 store, but not on 10 store, re-flash to 8.1, do not restore, install missing apps, then upgrade to 10.........make sure you backup before though
  • How about the resuming / Loading lag ? 
  • I'm not seeing Loading / Resuming lag from past 2 builds..
    It depends on how many apps you've pinned for start screen & how many apps are running in background & also on Ram too .. I've L 730 & presently I'm on 10572 ..
    And I am opening number of apps in background & not seeing any Loading / Resuming issue..
  • Are you saying I still have to limit the number of pins on the start screen?
  • That's a lie. Those screens appear with enough time to do a Screen Capture. This one was made from Start screen, pressing Back button to 'Resume' Microsoft Edge, the funny thing is that I had just one open Tab. 'Resume' screens are faster to disappear but they are still there.
  • Almost non-existent in the previous build and only saw it once opening contacts which I have about 700.
  • What power plant are you using? my L928 resumes and loads still.
  • Wouldn't call my 1020 a power plant but I did reset without a restore and it does have the same specs with an extra 1GB ram.
  • Thank you, By resetting without restoring I assume you mean you choose that option thats given during to upgrade process, Right?
  • As i said, If build 10581 will be relaese no new features but bug fixes and thats enough... Installing on my Lumia 830 upgrading from version 10572...
  • I don't see the update
  • I'm not seeing it either on my Lumia 1520. Been checking the internet religiously about this build and it's finally release, however I am yet to see it on my phone.
  • Be sure that you have the Windows Insider app installed and enabled. It might have been lost depending on how you've upgraded/reset your phone.
  • Did it appear already?
  • Insider app re-installed and set to Fast ring after the last update?
  • I do wish they'd include the Windows Insider app in the Insider builds, just like they're now including the Insider Hub directly in the build.
  • there are two update btw (10.0.10581) and insider fast configuration...
  • Looks good to me. I usually hard reset after each release but since I won't be able to redo my SD card settings I'll just let it be without a hard reset. :)
  • Microsoft has became expert in making people fool
  • Truth
  • Hope podcasts download again.
  • Mine never stopped
  • ok, now waiting for this thing MS is donig that they haven't done before. 
  • PC and Mobile build on same day?
  • Yes, that's mentioned in the previous article.
  • How big is the update if you had to update from 8.1?
  • Depends upon your wifi speed... May be 30-45 min
  • 800-900 MB approx.
  • So like... fifteen minutes?
  • Well at least hey Cortana is back!
  • Can anybody tell me that 3g only option has come back or not???
  • Not until now. But it is in consideration.
  • TX buddy
  • You can select max speed connection speed in Settings/Cellular&SIM/SIM Settings between 4G/3G/2G. Is this your question?
  • Hw much celluar data will it consume to upgrade to 10581?round figure?
  • i think 500mb plus but it totally depends on your phones model. i have 830...
  • 500-600 MB
  • I've L 730 ..
    Previous build 10572 was around 777 Mb for my Mobile..
    & 10581 will also be around that..
    But it depends upon devices..
    So It May be 500 - 800 Mb
  • 736 MB, Lumia 640XL
  • I think "Hey Cortana" counts as a new feature rather than a bug fix. Even if it's just reintroducing a feature - Really glad to see it back as a 930 owner
  • I have no option to enable Hey Cortana on my 930.. Where is it?
  • What a Let Down compared to yesterdays Teasers.  Way to go Gab !!
  • Hey John. We like your background picture and tile color. Can you share?
  • I want that wallpaper from article header photo, please! Could somebody post a link?
  • OMG HEY CORTANA!!!! That makes my day.
  • Why can't they just release these new builds to Windows Device Recovery Tool? When? SOON??
  • That wouldn't allow them to test the upgrade functionality. (Which is very important.)
  • Good idea..
    But The name itself tells you..
    It's A Recovery Tool.. Not Upgrading Tool..
    Recovery tool only scans for RTM OS & not testing builds..
    If they wanna perform that kind of things then they should develop some other app..
  • Updated to latest build. Still no "Hey Cortana". Anyone else with this issue?
  • So you got 10581 installed already that was released less than an hour ago? (It is supposed to have "Hey Cortana" enabled again.)
  • Maybe its only available in special countries?
  • If you have the right phone, try setting lang/local to USA.
  • Hey Cortana shows for me at last on UK L930 but she can't hear me when trying to train... Maybe next build !!!
  • Oh
  • I think we need to dig in to see if there is something they haven't done before. Two updates in one day is not groundbreaking enough for me.
  • Yea well that's you
  • That's because the fanboys have set the bar low for quite some time now. At this point they are happy with anything they get.
  • He never said anything about it being groundbreaking.  All he said was that they are going to "do something they've never done before".  You're lack of reading comprehension is setting you up for disappointment.
  • Those of you using it, what percentage towards completion do you feel it is at?
  • The last build was very close.
  • Groove through bluetooth still needs a lot of work.
  • How large the build is
  • about 620mb
  • 500 - 800 Mb depends on mobile
  • Hey Cortana for ALL Countries (like Germany) or again just some selected like on 8.1?
  • Select countries only...
  • This will be interesting in that the storage bug will prevent a lot of users from hard reseting. This is actually a good thing. Now MS will get a lot more feedback from users who are not starting clean instead of the few like myself who never hard reset. We're really going to see what this build is made of now. I'm also glad to see for once no back breadking or ridiculous regression bugs, so hopefully they've finally fixed that nagging start screen "loading..." bug.
  • Thinking about upgrading to this build. How was the last ones performance without the hard reset?
  • I haven't tried the previous two because I didn't want to roll back my 920 but it seems like opinions were quite varied. I'd still stay away from daily driver.
  • My phone has been sat on "Downloading updates 0%" for about 25 minutes now... Anyone else having trouble downloading?
  • I was stuck at 13% for about 20 min.  It suddenly jumped to 55%.
    UPDATE: ​Just saw  Gabe's tweet: @ArizonaWillie @Chris123NT Depending on what build you're coming from, may be hitting the 0% progress bug. Keep unlocked and on DL screen    
  • Yeah, it suddenly moved onto "Preparing to install" after about 35 minutes.
  • I'm about 60% through the post restart configuration
  • +1 mine to still 0%
  • Oh ok. I thought it was because of my current (ongoing) Halo 5 download on my Xbox One. Which is taking f-o-r-e-v-e-r
  • Gabe tweeted that depending on the build you are coming from there was a bug that resulted in the progress staying at 0%. He said keep it unlock