Tested on ZTE v830w

Actually the baseband is there, but because the /nvram (folder/partition) has corrupted, the Android OS were unable to recognize it thus showing Unknown.

First step, ensure your phone:

  • On Stock ROM
  • Rooted
  • PC have ADB drivers installed (If you don’t have it please ask Uncle Google )

Solution :

  1. simply delete the whole /nvram (folder/partiton). If your phone coldn’t recognize SIM card, wait a while after deleted the folder, your phone should have signal after maximum 10 seconds of waiting
  2. Actually you can also get restore your IMEI, WiFi MAC, BT MAC, SN by restoring a backup created by MTKDroidTools with other exact same model as your phone.

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