If your baseband is unknown, an IMEI repair won't work. You must first re-flash the Modem/NVRAM files using a stock firmware flash. How to Verify the Repair Once the phone reboots, open the dialer and type: *#06#
This is almost always a driver issue. Reinstall the LibUSB filters and the MTK VCOM drivers.
Ensure these are correctly installed so your PC recognizes the phone in Preloader mode.
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