What, another build? Microsoft has just released build 14390 for Insiders in the fast ring on PC and phone which includes a number of new fixes and other improvements. Since we're at the tail-end of development, there are no new features in this build.

From today's announcement:

Improvements to PC

  • You should no longer see the error code 0x80004005 when enabling Developer Mode on the "For Developers" Settings page if your PC is using a non-EN-US language.

Known issues for PC

  • AWARENESS: A recent fix went into place for the Hyper-V firmware that will that affect the ability to boot Windows Server 2016 Tech Preview 5 VMs with Secure Boot enabled. A fix for TP5 builds has been developed however, due to release schedules, the Insider Preview build changes will be released before the TP5 fix is released. During that time, if you try to boot a new TP5 VM with Secure Boot enabled, it will fail. The workaround is to disable Secure Boot during this period.

Known issues for Mobile

  • Voice Recorder does not show up consistently as an option for Call Recording. We heard your feedback and plan to release a Voice Recorder app update via the Store soon that has the fix for this issue.

  • Wallet users are prompted for a PIN twice when using tap to pay from a locked phone. You can enter their PIN twice and tap as usual once the phone is unlocked. A fix for this will come as a Wallet app update via the Store.

  • REMINDER: We have changed the backup format for Windows 10 Mobile devices to reduce the size of the backup stored in OneDrive. As a result, if you do a backup on a device running the latest Windows 10 Mobile Insider Preview builds and move back to the released version of Windows 10 Mobile (Build 10586) and restore from your backup – your Start screen layout won't restore and remain the default Start layout. Your previous backup also gets overwritten. If you need to go back to Build 10586 temporarily, once you are on Build 10586 you should disable backup so it doesn't overwrite the good backup from Windows 10 Mobile Insider Preview builds.

My sources are telling me that this build could very well be the one that will roll-out to the public on August 2nd, meaning it's the sign-off build or "Release To Manufacturing" (RTM) build. I'm still gathering details, but it's looking increasingly likely that this is the final build. Exciting stuff indeed.