Basically, what I've done is tricked the phone into believing it's a T-Mobile version and installed the TMo TWRP. I've tested this on a SGH-S970G without issues. I don't have service on it yet. I'm hoping to find an unlock (with the help of others) and be able to use this on other GSM networks.
I'm not responsible for what you do but if you'd like to try it, here's the steps:
- Root your phone. I used Kingo Root - http://forum.xda-developers.com/show....php?t=2473747
- Change your build.prop so that it reads as a T-Mobile S4. I used Root Explorer to navigate to /system/build.prop. Change:
ro.product.model to "SGH-M919"
ro.product.name to "jfltetmo"
ro.product.device to "jfltetmo"
Remove the quotations.
- Reboot your phone so the changes will take place.
- Install GooManager from the Play Store. Click menu, "Install OpenRecoveryScript", and "Yes" on the menu prompt. Your phone will download TWRP Recovery and flash it to your phone.
- Click Reboot Recovery in Goo Manager and make a backup of your stock rom.
- Download a TW Based 4.3 T-Mobile rom. Here's a stock deodexed one that seems to work nicely - http://forum.xda-developers.com/show....php?t=2545711
- Enjoy your awesome phone!
I've also tried to install a T-Mobile and/or AT&T radio without luck. Here's that thread - http://forum.xda-developers.com/show....php?t=2324667.
I've tried flashing the radio through Odin, Mobile Odin, and TWRP. The Odin flashings fail and the TWRP seems to flash successfully but when I reboot, the old modem is still there. Using this tutorial, I've also pulled the modem for anyone who'd like to try to modify it or otherwise figure out how to change modems on this phone.
I'm attaching a screenshot of my current build status.
Hopefully, we can stir some development for the SGH-S970G!