On China keypad phones, this issue often arises due to:
Many China keypad phones have hidden menus for direct IMEI editing. Try these common codes on the dial pad: *#0160# , *#0161# , or *#*#3646633#*#* MediaTek (MTK): *#3289# or *#66*# Spreadtrum (SPD): *#*#83781#*#* Alternate Codes: *#0066# , *#*#1010#*#* , *#*#1122#*#* china keypad mobile imei repair tool