The reset config procedure in the 6100 is a little more involved that other devices. And it fact I would only attempt it in 21.05.2 if you have no other option. The timing is such that it's difficult unless you can see the console output and at that point just use the console!
This is fixed in 22.01 where the feedback from the LEDs make the process relatively easy.

The reset is a two step process:
Power on the device. After a few seconds, when the green circle LED changes from orange to blue, hold the reset button for 5 seconds. This 'short-press' initiates the reset.

Then after the drive has mounted the system recognises the reset has been initiated and asks you to confirm the reset. In 22.01 this is indicated by all three LEDs turning red. Hold the reset button until all three LEDs start flashing, ~13s.

The system then resets the config and reboots.

Steve