If you flash a generic version of the K33 firmware onto the device, you might encounter the issue. The phone works, but it cannot connect to a network because its identity was wiped.

After a successful flash, you may need to re-write the original IMEI if it becomes null; always use the original IMEI found on the sticker under the battery. User Sentiment

This firmware is – using a wrong version may brick the device permanently.

Fixing hanging issues, white screen displays, or app errors. Dead/Bricked State: