Originally Posted by huaweiU8800pro
On stock rom, sim works. But i want to run sim on 4.4.4 (kitkat). Whenever i install 4.4.4 through cwm recovery, sim not works. IMEI becomes unknown. So what should i do ? Please Help !!!
I reckon CWM recovery is not suitable for installing KitKat on the U8800Pro. Try the TWRP recovery.
If you still don't have an IMEI, or it is zero (Settings > About Phone > Status), you have to have an irom IMEI backup (requires any rooted rom).
I gave a go with CWM initially, but never got KitKat to work normally. TWRP it is.