It appears that the LTE versions of the Lumia 640 and Lumia 640 XL in Latin America have a small firmware update available. The update, which seems at the moment to be regional, bumps the firmware of both phones to 02177.00000.16025.27003.
From WindowsPhoneApps.es (translated from Spanish):
It's not clear at this time what, if any, changes this update brings. We'll be sure to keep you posted on any developments.
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