If you are located in the US, you should all have been updated successfully by now if you had unplugged power to the MCH, wait 5 to 10 seconds and plugging back power and waited 15 minutes. If you are located outside the US, your best bet is still to wait until the local servers are updated in your country. If you are in Iran or China, it is possible that you may not get an update.
Your best bet in those countries without an updated local server may be to
- Wait for an update
- Use a VPN service with US servers and try to update that way*
- Mail your unit to the US and have someone update it for you*
- Consider using a different NAS or cloud storage since WD servers are so unpredictable in your country.
*(There is no indication that the MCH has its localization locked or is region locked, so that the firmware used is probably uniform throughout the world.)
This security certificate problem which necessitated a force update originated from a service provided by Let’s Encrypt’s root certificate which expired globally on Sep. 30, 21. WDC had to force a firmware update on Fri, Oct.1, 21 and most users in the US were able to update on that day, however many users around the world could not because their local servers could not be updated. What you are looking for is the WD My Cloud Home OS4 Android OTA update which looked like this in the debug_logs:
