force re-install apk

[L Shaf]

Is there any way to re-install APK with different signature?
I'm using MIUI 9 and Un-Root.

Or maybe using backup data, I can
- uninstall the apk,
- install apk with different signature
- restore the data

if my way can be work, is there any recommendation backup app?

 

[BrownChoco]

My method in backing up data files from an apk is to locate all related folders of the app/game (in ./android/). If located, then I'll rename it by adding "1" at the end of folders name. So whenever I uninstall the app, the data files are not affected and I just need to remove "1" in the name of folder to restore the data files. EZPZ. ;-)