can you please tell me how can i downgrade my s4 from 4.4.2 to 4.3? i have the official 4.3 rom but couldn't flash it via odin. any help?
Root is not required to install a custom ROM or twrp.
Twrp will allow you to flash a custom 4.3 or 4.4.2 ROM but they may not have all the security updates.
The bootloader will be stuck at 5.01 and there is no way to downgrade it.
I don't know of a way to disable pop ups as I don't have an s4 anymore.
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