Diskpart használattal oldottam meg legutóbb, ide másolom:
"Set partition type ID via Diskpart
1. Press Windows Key + R to open the Run dialogue. Type diskpart and click “OK” or press Enter to run Diskpart.
2. Type list volume and press Enter.
3. Type select volume # (ex: volume 8) and press Enter to select the volume/partition of which you want to change partition type ID.
4. Type set id=# (ex: id=0B) and press Enter to set a new partition type ID.
(Tips: The leading “0x” of the ID is omitted when specifying the hexadecimal partition type.)
5. Type exit and press Enter to exit Diskpart."