First do you have a single bay My Cloud? If so, yes you can manually download the latest firmware and try to update your My Cloud.
Note that if you previously “unbricked” you might have trouble upgrading to the latest v4.x firmware. For some unbricking users the Dashboard was unreachable post v4.x upgrade. Here is one thread that talks about this particular rare issue.
https://community.wd.com/t/unbrick-then-firmware-upgrade-equals-no-dashboard/136666
