Restore backup.ab file on firestick? I'm trying to restore a backup file onto a fire stick 2 using adb restore backup.ab, however the restore confirmation doesn't come up on the fire stick. The device is rooted and currently have twrp. Is there a way to force restore without a confirmation?

Thanks
If the device is rooted you can manually restore the backup. 


On a PC extract the backup file using Android Backup extractor. 
This will convert the backup to a TAR archive.
(optional) extract the APK files (if the backup contains not only app data) and install them via adb.
Upload the TAR archive to your device via adb push and untar it.
Copy the files you want to recover into the right directories using adb shell and root permissions.