8210 to 8850

i'm having a problem in converting my 8210(rom5) to 8850.

after flashing MCU+PPM+Eeprom. Eepromtools says "Phone not Connected" when changing IMEI to original.

tried flashing MCU+PPM then Eeprom still the same.:(

i have a F/Mbus cable. do i need a pure Mbus cable?

Thanks!:)