edit: Moved to aokp thread since that's what I'm running.
Edit: Moved back since the quote doesn't exist in that thread
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If for some reason you have to toggle data. Toggle to "GSM Only" wait for the 3G or 4G symbol to come on, then toggle to "LTE/GSM/CDMA auto (PRL)"
This isn't working for me lately. I've tried this several times and I get back 3G but not 4G. In a wild frenzy to get data back, amid reboots and toggling, I went to LTE/CDM auto (PRL) in the testing menu, all of a sudden 4G came up perfectly. Is it possible there's some sort of menu index mismatch between the testing menu, network menu and the toggles? Each time I went in it seemed like the different menus had a different opinion on what the actual current setting was (like right now with data working, the testing menu says LTE/CDM auto (PRL) but the network menu has no radio button highlighted, a couple other times through they were showing different things).
edit: weird obvservation; I'm back to 3G, I look at the toggles and LTE turned itself off magically. I slide LTE back on, and go into the testing menu and I'm set up as GSM/CDMA auto (PRL) and network mode is set LTE/CDMA. I think it's time for me to pull code and poke around, this feels like the different apks/portions of the OS all have different takes on what the internal option value should be.