[Sprint Samsung Galaxy S 4 Android Development] FNetV1:
Resurrection Remix is what I am running right now, but I dont like the camera issue RR is having, the Camera is not stable, you might get a "Camera error" message and the only way to recover from that is to restart the phone among other problem that happens but at a much rarer frequency than the camera error. So I took a full nandroid backup on TWRP, then I flashed the WizCyan S6 Rom (this rom) and I through I had hit the jackpot that not only would I have a fully functional ROM for the L720T but that the phone will look like its a Galaxy S6 and with lots of bells and whistles I couldn't be more happier, then after I flashed it, I flashed the optional package to add in certain apps and features (just a few of them, but no more than a total of 5 or 6 of them) after I flashed that I restarted the phone, sure the animated boot screen that I had selected from the AROMA package was there and working, on the initial start it took a while which is always expected for a freshly flashed rom, after the phone did finally booted up, everything force quits, can't even complete initial phone setup as "Samsung Account" FC at the last stage forcing a restart of that stage perpetually. I have tried flashing the Aurora Kernel, nope, not a difference.

I retried twice, each time performing a full wipe, everything including wiping internal storage from TWRP, everything blank clean, I flashed the rom, then the aurora package with my custom selection, phone boots up, everything FC, then I complete the initial setup where you enter the google account details, on the last stage then Samsung Account Force Closes and sends you back to the start, perpetually. Then once again, I completely wipe everything on TWRP, reflash the rom, this time I dont flash the AURORA package and the phone boots up just fine this time, nothing FC this time. I complete the account initial entry process, I am at the home screen, I did had 4G connection up and running, I could make and receive phone calls, I could use the internet on the phone, WiFi did work, however SMS did NOT work. APN settings appeared to be broken/not available. Thinking that it could fix the issue I flashed the APN fix for Sprint and all that did was break the already working connection, but still APN was not visible. Once connectivity got broken the only way to recover from that was to re-flash the ROM from afresh. I gave up and restored my ResurectionRemix Nandroid backup.

I haven't flashed the Wicked ROM yet due to my tight work schedule, but maybe tonight I will get to it. Based on a user's review he says that Wicked ROM is the only rom working 100% for the SPH-L720T and he might be right as other ROMS I have tried for this phone a few months ago such as the Nougat AOSP rom also had deal breaker types of issues and when I did an initial inspection of the WikedX rom it looks like it could work without any issues, possibly making the ONLY rom that doesn't have any deal breaker of issues for the SPH-L720T.

I am surprised that there isn't more than 1 fully functional ROM's without any deal breaker of issues for this particular phone given its age, one would think that with time anything developed for said device would be close to impeccable, but I guess I was wrong.

I have a Sprint Samsung Galaxy S5 SM-G900P as my personal phone, domestically unlocked and currently using it under AT&T and its running ResurrectionRemix marshmallow beautifully, there is absolutely no issues with this phone with the RR for the past 2 or so years (give or take a few months), so I was under the impression that if RR DID make a very robust and stable MM rom for the Galaxy S5, that RR also must have made a very robust and stable MM rom for the Galaxy S4 given that Galaxy S4 is older than the Galaxy S5, thus it was on the market for longer time than then Galaxy S5 permitting that extra time for custom ROM developers to iron out and perfectionize these ROMS. But to my surprise the dialer app on the RR MM ROM for the Galaxy S4 is not even the same as the dialer app that came on the RR MM ROM for the Galaxy S5 which is the first sign that denotes differences for which on the surface, being Marshmallow made by the same developer, supposed to be the same. Anyways that's not so important nor did I care if everything worked fine.

So, thats my story of the Sprint Galaxy S4 Triband on the OK3 baseband and my journey of the search of a funcional decent ROMs for this device.