Generally the My Cloud OS won’t let you revert back to earlier firmware. Unfortunately WD removed or has hidden the previous firmware files that used to be available. If one does have a copy of the older firmware for a OS3 single bay My Cloud one can try to roll it back using SSH. One does so at their own risk!!! See the following post (or use the forum search feature) that has some information on trying to roll back the firmware of a single bay OS3 My Cloud. Note the information below applies ONLY to OS3 firmware. If your device is using OS5 that will likely require a different method of rolling back from OS5 to OS3.
