Write IMEI on unrooted Android Phone via Engineer Mode -

yesterday reset phone factory definitions , after rebooted imei missing (invalid imei). tried access engineer mode -> gprs write again, there's no button "write" add imei.

ps: phone not rooted, can confirm me, if that's reason can't add imei phone mtk6577 cortex-a9 dual core

thanks in advance.

now solve invalid imei problem no risk

1. dial *#*#3646633#*#*

2. then goto connectivity , select cds information

3. in select radio information , select phone 1

4. for sim 1 type at+egmr=1,7,"your imei number" , press send @ command

5. for sim 2 type at+egmr=1,10,"your imei number" , press send @ command

6. it show at command sent or command sent

7. reboot device , problem solved......!!!!!!!

8. enjoy.......!!!!!!!!!!