android - Bluetooth pairing not working with "unknown sources" .apk -


i'm using android epson sdk printing within app. works when running out of android studio on test devices.

the app sent out signed .apk through email distribution.

but when pairing attempted again unknown error shown.

err_failure 

epson sdk: err_failure = unspecified error occurred.

my question is, "unknown sources" apps lose permissions?

i've gone on skd cannot find anything. has distributed app, "unknown sources" had enabled, , noticed issues?

thanks

update:

the debug_unalinged.apk works.

i understand that:

aligned apk applications have uncompressed data aligned 4-byte boundaries, allowing accessed directly through of android apis. benefit of alignment supposedly less memory overhead when running app.

how can affect bluetooth connection printer?