It should be noted that you have not asked, until your last post, how to reload the firmware. Users here have no idea as to your knowledge or skill which is why basic troubleshooting steps are suggested first. You have not indicated what were the cause of the “many power outages” (lightening, poor electrical service, power line down, brown outs etc). Power line irregularities can potentially damage electronics causing weird issues to happen if the electronics are not on quality surge protectors or similar devices.
As indicated, you can search the subforums if you don’t believe what is being posted, the stupid OS5 indexing on certain My Cloud models can take days if there is a lot of media stored on the unit. Sometimes, this can cause the unit to be unresponsive. And the My Cloud Dashboard to be unresponsive.
If the firmware has truly been corrupted, and one has a single bay, single drive second generation My Cloud, one can attempt one of the various “unbrick” methods to try and restore firmware to the device. Some of those unbrick methods (by user Fox_exe) involves using a USB flash drive, other methods involve extracting the hard drive from the enclosure to “unbrick” method the unit and restore the firmware to the hard drive. One can backup any user content from the extracted hard drive (from the EXT4 user data partition on the drive) prior to attempting to “unbrick” the drive.
One example of a gen 2 single bay My Cloud unbrick process:
https://wd.hides.su/fox_exe/WDMyCloud-Gen2/_Unbricking_en.txt
Files used in that example method:
https://wd.hides.su/fox_exe/WDMyCloud-Gen2/usbrecovery.tar.gz
https://wd.hides.su/fox_exe/WDMyCloud-Gen2/Developing/uImage-wdrecovery
https://wd.hides.su/fox_exe/WDMyCloud-Gen2/Developing/uRamdisk-wdrecovery
The multi bay My Cloud units may have a different method of firmware restoration when the My Cloud dashboard cannot be reached.
Edit to add: A search for blinking blue LED will bring up a number of hits in forum (https://community.wd.com/search?q=blinking%20blue%20led%20%23os5) with various suggestions. One method some used to fix their blinking blue LED issue was the following:
Run the command: e2fsck /dev/sda3
