That does make sense now, thanks.

This is OT but wouldn't bother taking time constantly fully formatting (aka "erasing") any flash memory such as USB sticks and media cards unless absolutely necessary as it writes zeros to all bits. Simply deleting unrequired data is usually enough, and a "Quick Format" in Windows simply marks the drive as fully available so both latter methods cause less wear and tear.... but it's minimal anyway.

I'll decrypt the 41.bin when i have a chance to check it then depending on that result we can carry on. Standby.