[Q] Mail.apk auto-restores wrong version
I backed up my mail.apk before replacing it with a modified version. But the mod didn't work, so I've tried storing the old one. And it won't stay.
When I copy it over, via TWRP or manually, clear cache/dalvik, and reboot, a different file is there after reboot. And I cannot create Exchange accounts - neither those using office365 nor my own server which does not require admin rights.
The original file was dated 18 April 2014. The file I was replacing it with was from June 2014. The auto-restored file is from 01 Aug 2008 and is .5.05MB.
The ODEX is restored also, as 18 April 2014, regardless of what I put down or delete.
Where is the invalid /system/priv-apps/ getting the backup it's putting on from? How can I prevent this?