1. Upgraded my Note 3 N9005 from stock 4.4.2 (rooted) to stock Lollipop 5.0.
2. Decided to downgrade to 4.4.2 again and used Odin to flash original stock firmware. Something went wrong and I got Unknown baseband / Null IMEI. Phone lags and hangs and bootloops.
3. Flashed various stock 4.4.2 firmwares without success at getting baseband or IMEI.
4. Flashed stock Lollipop 5.0 again and lags are gone and phone is stable. Baseband is back but IMEI is still null.
Since I can get back Baseband in Lollipop, I am guessing that this could be a software problem instead of hardware?
I would like to rebuild the original IMEI. Is that possible? Can anyone recommend which dongle/box is suitable for this purpose? From my searching, Octopus/Octoplus and Z3X seem to have the best support. What about BST dongle? Would any of these 3 be sufficient to do the job?