Cause of problem issue as far as I know in my experience. The NVRAM file firmware needs to flash to phone to prevent this problem. Write a 15 digit IMEI number same as your phone using IMEI tool. If the problem is 'Invalid IMEI' but has a good Baseband in About menu of the device.ġ.
If a problem still, Its a module Baseband Hardware problem. Use the Paid tools or Free tool to Fix it, Unknown baseband buttonģ. Restore factory setting on the menu of the phoneĢ.
After writing a Good NVRAM database to the device If this is still 'U nknown Baseband', Try the following I made in my experience.ġ.