If you take the drive out of the USB enclosure, then yes. It's your call.
If your drive is internal, then no. The firmware that you replace with are also official, only better.
UHD Drive Tool tries to match your drive firmware with the best option found on our server. If it cannot find a firmware for the same drive, it will suggest something similar, but then updating to that will mean that you cross-flash. That is considered EXPERIMENTAL, don't do it if you don't want to take chances. It is possible that the cross-flashed firmware does not work as expected with your drive or does not work at all. We create a backup of your original firmware so you can flash back. Contact us if you experimented with cross-flash but ran into troubles.
Do not power off, disconnect the UHD drive or close the UHD Drive Tool while the downgrade process is in progress! Otherwise, it may cause your drive to be screwed and very likely to become a brick.
However, if this does happen! No necessary to panic, either! Before the downgrade process, the UHD Drive Tool shall back up your old firmware first. The later versions of the UHD Drive Tool shall be able to restore your previous firmware back.
Is this case, please try the following:
a). Disconnect, reconnect the UHD drive and then reboot your computer;
b). Manually enable the UHD drive from the Device Manager.
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