How to restore from backup of Android Bitcoin Wallet Bitcoin Wallet for Android allows you to back up your wallet.  It asks for a password when doing so.

After much faffing, I finally managed to.. dum, dum, dum! .. copy the file to the SD card, and then I removed the SD card and mounted on a Linux system.

According to this question, the way to decrypt it is 

$ openssl enc -d -aes-256-cbc -a -in bitcoin-wallet-backup-2016-09-30


but I get:

enter aes-256-cbc decryption password:
error reading input file


when doing so.  This is an extremely poor error message from openssl.  I have confirmed that the file is readable using other utilities.
The best way to restore a backup file is always to use the same app used for creating the backup. In other words, install the app again, then use Options > Safety > Restore wallet.