Hi everyone,
Before blasting away with comments as to why I would do this, here's my story,
I live in Canada and just brought home a i9508, a China variant of the S4. It belonged to my dad and he didn't want it so I just took it. The i9508 doesn't have Play Store, and it doesn't work on Canadian 3G network.
So to me, the phone is useless right off the start (don't intend on selling it either, who wants it?) So I had 2 options:
1) Leave the phone as it is, and probably use it once every 1-2 years when I visit HK
2) Flash custom roms on it fully aware of the risk it will have so that there's a possibility I can make it more usable
So in the end I went with option 2.
I followed a guide and flashed TWRP for i9505 using Odin onto the phone, and used TWRP to install chainfire SU, and it actually worked (but SU wouldn't open because some sort of security on the phone is blocking it)
Next step, I downloaded the CM version for i9505 and flashed onto the phone, and that worked too. Only problem I've encountered was that the phone would only boot after a fresh install. If I installed CM, turned the phone off after the initial start up, the phone wouldn't boot pass the Samsung logo.
Up until this point, I didn't make a backup, because of my arrogance, cause I have available a copy of the official firmware, in case anything happens.
So I figured at this point, maybe if I restore the original firmware, and try the whole process again, the custom rom would work. So I went into Odin, flash the firmware with PDA, and failed. It just wouldn't work. After retrying it a couple of times, and downloading different updates of the firmware, nothing worked. Only thing working right now is, I can get into Download mode, and I can get into TWRP recovery (but for some reason, I can't flash the zips that I've adb pushed onto the phone, zip can't open)
For me, if it can't be fixed, then it's really SOL. But if there's a way to fix it, I'm open to testing anything people have in mind, cause afterall, this phone is paper weight either way. I'm interested in seeing if I could enable 3G by flashing a i9505 radio, despite warnings, although, I've never actually came across a thread where someone had actually tried it before.
Either way, if someone has any idea on how to fix the phone, and wouldn't mind sharing it, that'll be greatly appreciated.
Working
I can get into Download mode, but Odin is failing (if you need the error please let me know and I'll post it)
I can get into TWRP recovery, but can't flash files
I can get into adb