HTC One Ting - CyanogenMod (LTE fix)
Jul 16, 2015
From my previous post I said that I decided to root my HTC One and flash the latest CyanogenMod ROM to it. After doing this 4G LTE stopped working (and possibly MMS but I never tested that) but everything else was working fine. After a day or two of Googling around I finally found a thread describing the same issue that I was having.
Basically, the Ting 4G APN data gets erased when you flash the m7spr ROM to the phone. Luckily someone on the Ting forums made a flashable ZIP that you flash after Google Apps, and it actually worked for me with the CM 10.2 nightly ROM. Unfortunately, 10.1.3 didn’t seem to work though.
https://help.ting.com/entries/23423026-Flashable-Zip-Fixed-LTE-eHRPD-for-CyanogenMod
Update For CyanogenMod 11 use the lite APN here: http://forum.xda-developers.com/showthread.php?t=2340437
If it does not work you may need to wipe everything and insert the APN in the ROM before flashing. That is what I had to do.