hi guys, i have a nexus 4 with some problems as below

1. Takes very long to boot, i think 1 min or 1 min +
2. No Signal, no Imei , baseband unknown. (running on 4.2.2)

things i tried.

1. Flash factory image (4.3), bootloop
2. Downgrade back to 4.2.2, can boot but problem remains.
3. Flash older radio/baseband, problem remain.


Any other things i can try before i send it for RMA?

i unlock bootloader, and flash by using wug nexus 4 toolkit. I tried to flash it to 4.3 factory image, but stuck at bootloop.

I downgraded it back to 4.2.2 , can boot, but still having the same problem where there's no signal and no imei and unknown baseband.

Lastly i tried to flash to an older radio (0.33), and still no signal , no imei and unknown baseband.