Check This
1. *#92702689# = Make sure the lifetimer is 000000:00 value.
2. *#06# – Make sure the phone’s IMEI number is same with the box
3. *#0000# – Make sure it’s firmware is up to date
4. Check the screen for dead pixel by changing the screen to 1 colour.
5. Check for any physical or tempted damage on the phone body
Hi! Thanks for your good advise. May i know how you set the scree to 1 colour for checking of dead pixel?