Previously I used
jfltespr. But Lineage OS doesn't show any builds for that. Did one of the other builds replace that?
jfltexx sounds appropriate but I can't find anything that confirms that it will work on S4 Sprint.
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I've been using the unofficial "Optimized LineageOS" ROM by JDCTeam for several months now, and it has been working wonderfully, thank G‑d. It is a ROM for several S4 models (I think this is called a "unified" aka
jflte build), including the
jfltespr (which does not yet have its own official LineageOS ROM, as of 2017/09). It has generally been updated monthly.
jfltespr is the code name for the sprint variant of the Galaxy S4, and
jfltexx is the codename for the international S4. ROMs for the
jfltexx will most likely not work with the
jfltespr, since they use different cellular radio protocols. (When I tried to install the
jfltexx version on a
jfltespr device using TWRP, this was detected and an error message was issued saying it could not install on the device since was the wrong device type).
As of this writing, LineageOS 16 is officially supported for the Sprint Galaxy S4.
Note that I had trouble installing this image using the last available version of TWRP for the Sprint S4, and had to flash the lineageOS recovery image before I could get the rom to flash.