Requirement:
.download mtk-engineering-mode
.write down imei number of your phone under the battery
(imei 1 for sim 1) , and imei 2 for sim 2)
.after u download mtk-engineering-mode ready
.open mtk-engineering-mode
.click conectivity,than cds information==>radio information,=>phone 1
than click on AT+EGMR=1,7"type your imei number" than SEND AT COMMAND
.after click phone 2, AT+EGMR=1,10''type your imei number" than SEND AT COMMAND
click done and reboot your phone.than it will work with imei back.