Some chips require external power (VCC and VCCQ) to be recognized by the software. Backup first:
In some repair ecosystems, these tools are used to change the region or SKU (Stock Keeping Unit) of a device by rewriting the entire firmware partition, though this raises warranty and software licensing concerns. Mk Emmc Plus V3.1
The V3.1 update specifically focuses on stability during the flashing process. Unlike some generic tools, MK eMMC Plus is often praised for its: Some chips require external power (VCC and VCCQ)