Wednesday, 7 October 2015

Poor Cellular Reception After COI5 Firmware Update



I flashed the firmware for COI5 manually via odin and ever since then I cannot connect to LTE. Furthermore, I can barely connect to any signal. The bars show up, but it often takes a while for the 4G icon to show up. When it does, I am still not able to place a call, with Wi-Fi calling being the only hope I have to do so, but calls placed to me that way go straight to voicemail, so I have to call out from my phone.

Note: Knox is tripped, as I was rooted. I am also in an area where I alway get full bars of LTE, so location is not the issue.

Troubleshooting steps I have tried:
  1. Reflashing COI5 firmware via odin.

  2. Adding the LTE APN for T-Mobile.

  3. Using Smart Switch to do emergency recovery.

  4. Flashing BOH6 firmware (did not work as I don't believe you can downgrade firmware, was worth a shot anyways).

  5. Flashing different custom ROMs (all repeated the same problem, which is how I narrowed it down to having to do with the firmware).


I am currently running completely stock at the moment. If anybody has any suggestions on what I should try next or how I can fix this, I would greatly appreciate it.



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