You have to delete the modemst1 and modemst2 partitions then reboot the phone.
fastboot erase modemst1
fastboot erase modemst2
You have to be in bootloader mode and connected to the computer of course.
I did the same thing a few months back, my post is probably still floating around somewhere on here. Took me 3 days to find the answer above and get it back working normally. Haven't had any issues since though.
---------- Post added at 06:47 PM ---------- Previous post was at 06:42 PM ----------
Link to my post and the quoted post that fixed my issue.
I have this problem too after I flashed the developers version of Nougat and Marshmallow. I was stuck with 3G, sometimes I would switch to LTE and then it would go right back to 3G.
I deleted the modemst1 and modemst2 and rebooted. At first the phone complained that it could not find any data signal. So I updated the profile and phone rebooted. After reboot and I NO signal and the No Sim icon was active. I did the *#*#4636#*#* and the phone was on WCDMA (preferred). I could not change it from this setting and the phone would reboot after 10 minutes.
I flashed the factory Sprint ROM and deleted the modemst1, modemst2. After reboot and the initialization screen I had LTE! Amazing. Then the phone went through the activation process and rebooted. It booted up and displayed the No Sim icon and now I have no service, again.
What partition do I need to delete and in what order? As carrsteven said, this is really frustrating and I just want my phone back to normal.
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