. . .but standard unbricking procedures should work for the Single bay myclouds. The newer units. . .have had people perform rollbacks using “unapproved methods”. A search will reveal a few threads.
So there are two options now.
One is to flash the new or old firmware using another method to bring DL4100 alive, but I did not find anyone done it before, so I have no idea how to do it. It seems that WD did not implement a rescue method.
I also plan to buy a Synology NAS like DS920+. Can I just move the disks to Synology and recognized them? If not, how to recover the data from them (raid5)?
I have needed to pull power plug for 30 sec after a firmware update to get unit woking.
then after power restore system finally booted correctly.
try a re-do of the firmware and note there may be a series of firmware versions to install
(I may be thinking of os3 which needed to be latest before jump to os5 ?)
I kept it unplugged for a day and powered it on, but the symptom is the same. Since it does not boot to the system, so I need another way to flash the firmware, which is not available.
At this moment, it is quite dead, on the second night of the OS5 update.
Synology formats each disk with DSM so its not going to read WD disks, I moved from a WD to Synology and had to reload data from a backup. If you can’t power up your device, I’ve read (but not tested) that you can connect all disks in the raid to a PC and mount your volume there, easier in linux than windows. There are many youtube videos to that effect and I hope it works for you.
DS920+ personally makes me uncomfortable with one of the RAM slots welded, a minor failure there outside warranty may tank the device. Unless you use transcoding, 1621/1821 may be a solid choice at a higher pricepoint though cheaper per bay and come with better AMD processors, ECC RAM, shielded case and internal PSU, a much better value proposition overall. All Synology units have the same DSM software which is generations ahead of WD.