Yea, from version 3.0.0 onwards you cant restore backups made with older versions. So its better you use the older builds. Or can use original oandbackup appHello.
So, my new device is ARM64; old device is not. I installed an old version (0.3.5) on the old device; new device has version 4.0.
I haven't tried to restore anything yet, but, is this going to be a problem? Should I installed an older version on the new device and try? Any other work around that might help?