[Q] Is rooting needed prior to downgrade stock firmware to previous version (stock)?
I have tried to downgarde S4 i337m Bell Canada from 4.3 to 4.2.2. Sam Mobile version - and the flash crashes at 2% (fails) using ODIN. Using Odin I can flash back to 4.3 and it works.
Is this an issue with the firmware file itself, or do I need to root and prep the phone in any other way?
I think the file is the cause, I don't see how the Phone's 4.3 would 'block' the flash.