So I Odin my stock firmware, install CWM and then restore backup via CWM. Isn't Nand Backup a sort of partition image? That way it should be restored no matter what firmware you're on, as It should clear entire memory and replace it with your backup. That's how it works on PC
For GB 2.3.6. I'm almost certain if you try and restore a nandroid backup of your phone in recovery while on your newly flashed jb rom of GB 2.3.6 you'll get stuck in a boot loop. [emoji33] look on Google about it..
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