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SPH-L720 custom rom help w/ unlocked phone...

27th May 2014, 04:12 AM   |  #1  
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Flag Madison
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I see that all the builds for this phone through CyanogenMod 11 have been merged, and require a custom built version per phone. I get that, and can follow instructions, I've used Linux before.... My question is I don't know how to merge all the different data I'm reading into what exactly I need to do for this phone. The issue is it's a bad ESN phone running stock Sprint 4.4.2, originally with NAE baseband which I downgraded to MDC in order to do a domestic unlock. Now it's working fine with HSPA+ and I don't want to break functionality (reading issues with calling in/out, etc). So, what do I need to do in order to get CyanogenMod 11 to run on this unlocked Sprint phone on AT&T, with MDC modem and NAE bootloader?

The following is the post I was referring to that confused me. It's about phone issues with non-stock roms on sprint unlocked phones.
http://forum.xda-developers.com/show....php?t=2539794

Well, it looks like the 100% sure way to get this working is to do the outlined steps in the post linked above to the nightly builds of CM11, which I will link below (notice the spr/att designation at the end of the link)...
http://download.cyanogenmod.org/?device=jfltespr
http://download.cyanogenmod.org/?device=jflteatt

Other way looks to grab a jflteatt labeled rom from the Sprint Android dev subforum, but it looks more hit or miss. I might be way off and overthinking this, but I'm gonna try the mix/match way.
Last edited by blazie151; 27th May 2014 at 05:49 AM.
27th May 2014, 04:29 PM   |  #2  
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Flag Madison
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Well, I ended up working this out myself. I grabbed the nightly CM11 spr and att jflte builds, then followed the directions from the post I linked before that showed how to mix the 2 so the Sprint boot.img was in the AT&T build, including changing the updater-script so that the assert line read "jfltespr" in the 3 locations it had "jflteatt", then flashed the jfltespr CWM recovery from Heimdall, used recovery to wipe data/cache/darvik, installed the mixed rom from recovery, then installed the Chronic kernel (blackscreen without this), and the gapps apk for CM11. Once I was done everything worked perfectly, I only had to change the APN to the ATT Phone one for HSPA+. From what I can tell the CDMA portion of the phone is pretty much gone, and it shows the phone model as the AT&T version instead of the Sprint version (ie shows l337 instead of l720). The correct phone number from the SIM is now properly displayed as well. Also, with the Chronic kernel (slight OC) and CM11 the phone is lightning fast and responds instantly. Overall I'm very happy with this. Hope this helps anyone else in the same scenario. BTW, still using MDC modem from Odin flash during the domestic unlock.
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