You may find solution to this error in other threads (found via a forum search using the magnifying glass icon upper right).
https://community.wd.com/t/manual-update-error-device-does-not-have-enough-space-for-upgrade/94668
https://community.wd.com/t/problem-with-firmware-update/96134
https://community.wd.com/t/not-enough-space-for-upgrade-error/93240
https://community.wd.com/t/easy-method-to-downgrade-to-previous-version-of-the-firmware/93489/86
Do a search to find more threads that may help with that specific error.
