Nokia 5130 XpressMusic shuts down by itself and restarts!

How to repair nokia 5130 Xpress Music shutdown itself and restart

1. Turn off your nokia cellphone 5130
2. Remove the memory card from slot, turn on your cellphone
3. If the problem solved, then format your memory card from computer
4. If the problem not solved, check your power switch ( on/off switch), replace switch if needed
5. If the problem not solved, you need to upgrade firmware version (latest one)
Upgrade software needed repair tool box, like Ufs3, Jaf, etc.
6. If the problem not solved, resolder Flash IC, replace flash IC if needed ( technician level)
replace flash IC needed rebuilt IMEI and tuning energy management.