*#9090#
1. Hard reset phone
2. Connect your phone in USB debugging
3. Press Repair Imei
4. When he writes "Now connect phone to UART cable" you do * # 7284 # you choose MODEM - MODEM and you reboot the phone and you do * # 9090 # you press "SPEED 921600" and you reboot
5. Connect UART cable C3300K
6. Repair imei OKI.