lenovo s850 invalid IMEI

Sir recently I flashed new row in lenovo s850 then is said memory full in sp flash tool, and I tried flashing another time with different updated version row it flashed successfully but it cannot detect my imei number, it is displaying invalid imei. Can any one help me.

cwm recovery for lenovo s850

I hav tried a couple of processes to install cwm recovery in lenovo s850, but most of them are not working properly some of them hav problem in touch for twrp recovery, can any one post the cwm recovery tool and recovery.img for lenovo s850. Thnx