userdata .backup android
The checksum prevents of stealing data (put sdcard into someones phone and create a backup). You can not restore to even similar phones.
I posted the ektoric solution, please download the script from page 2. This skips checksum and makes it restoreable to other phones. Root is required, but no need to flash custom recovery.
http://forum.xda-developers.com/showthread.php?t=2528969&amp;page=2