I got a CID52 k800i with R8BF003 firmware & patch unlocked it with setoollite. But got the following problems after unlocking

Sometimes there is a message on the screen "clipering not provided by operator" & get stuck when getting calls & receiving calls
Sometimes it stucks on the startup screen when powering on

I did flash the phone with a old firmware using Setool Box, But sometimes it still shows the message "clipering not provided by operator" when getting & receiving calls. Also I got this same message before with the R8BF003 firmware.

Is there any damage to the GDFS ?

Please help me to solve this problem