I've used CM12.1 based ROMs for a while now, and with my talent have managed to brick my bacon (oneplus one global 64GB), and unbrick it (using this guide)
I've restored it to stock with no problem using this tool.
my problem begins when i try to update to any LP ROM - flashing such ROMs' zip files in TWRP returned "E: error executing updater binary in zip". i found two solutions to this error:
1. first one is described in this thread. i ditched this method after it got me stuck in bootloop every time after flashing a ROM
2. second one (probably the way it should be done) is to update device firmware like described in this oneplus forums thread. flashing this zip indeed allowed me to successfully install my ROM but with one big problem - the SIM card is detected for a few seconds (even then the device wont find any networks) and then drops to "no SIM card detected - emergency calls only" then it gets detected again and so on...
I've also tried flashing some different modems like described here but it didn't change anything
have anyone encountered any network related problem after upgrading to a CM12.1 based ROM or have any idea how to solve my problem (mobile network connections won't function after upgrading to cm12 firmware)?
help would be very appreciated!
edit: if it helps, i also found that OTA updating to the latest build XNPH44S also breaks the phone's ability to connect to a mobile network