Hydra now offers a "Digital License" that works without a physical dongle but requires an official paid subscription.
Installing or upgrading stock ROMs in EDL (Emergency Download) mode [5, 6].
Put the device into EDL Mode (usually by holding Volume Up + Down while plugging in the USB).
Instead of risking your hardware with unverified cracks, consider these options:
Removing Google Factory Reset Protection locks [2, 5].