My wife's XT1600 variant is no longer her daily driver, but I recall she facing no mobile data, whatsoever, after flashing the ROM through TWRP. Ever since, she uses the lineage recovery which is released along with each and every ROM. You could give it a try!@mmortal03 , I've gave it a try 2 more times with TWRP 220.127.116.11 to install LOS 14.1 and then 17.1. Each time data was working on 14.1. After the first install of 17.1, I've noticed that only 1 SIM had data. On the 2nd trial, only the other SIM was working ! I definitely cannot understand...
As I don't mind having data on 1 SIM only, I think I'm going to stop my trials...
I seem to recall reading somewhere that harpia - or some variants of it, at least - has only one 4G modem, so that you could have 4G (or LTE) on either sim, and 2G on the other, but not 3/4G on both.
Oddly enough, it shows only 4G in LOS 17.1 (and also AICP), whereas in the earlier RROS it shows LTE. I will admit to not being quite sure of the difference.
The descriptions are not very explicit. If Jeferson could give us some lights about these fixes ...
Start over. Flash stock Nougat with fastboot which installs the Nougat firmware. That is the main reason to flash stock. I don't mean flashing a recovery back up. Once the firmware from stock is flashed you NEVER need to flash modem again. It's there.
The modem usually does not flash on the first try and you have to fastboot flash it more than once (usually twice). Make sure modem flashed. Check every ROM fragment that it flashed. Then fastboot LOS recovery. Then flash 17.1 with LOS.
Your SIM problem is reeks of a firmware problem.
Like @hamelg and @Brandroide, I could not get data to work properly on LOS 17.1. I confirm that first installing 14.1, then booting that version, then upgrading to 17.1 did the trick.
My own path was:
It is very unclear what is wrong with LOS 17.1 and why booting 14.1 before installing 17.1 fixes it.
- install TWRP (LOS 17.1 recovery would not allow me to install 14.1)
- factory reset + wipe system
- install 14.1
- boot 14.1 and check that data is fine
- reboot to recovery and flash 17.1 (+opengapps) over 14.1, wiping cache and dalvik only
Does it mean LOS recovery is mandatory to flash LOS 17.1 and avoid the data connectivity issue ?
adb reboot bootloader fastboot boot <filename-of-LOS-recovery>.img
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