There are two methods of unbricking a gen2 single bay My Cloud. If the first method using a USB flash drive formatted for FAT32 doesn’t work try the “alternate method” which uses a Linux boot CD/DVD/USB flash drive.
Unbricking English Directions:
https://drive.google.com/file/d/0B_6OlQ_H0PxVQVhnLVJOdDZISUU/view
Ubuntu is one popular Linux distro that offers a boot CD/DVD or boot USB Flash Drive option.
Edit to add (with updated corrected links to needed files):
One of success-story with this howto:
https://community.wd.com/t/my-cloud-gen2-using-an-8tb-hdd-and-formatting-failure-error-code-600/221499/1
0. Download these files:
http://support.wdc.com/downloads.aspx?g=904 (Original firmware)
https://community.wd.com/t/wd-my-cloud-v3-x-v4-x-and-v2-x-firmware-versions-download-links/148533 (past firmware download links if not using latest firmware)
https://drive.google.com/open?id=0B_6OlQ_H0PxVUWdCU01DcTdMWk0 (usbrecovery.tar.gz - WD Recovery + My miniOS)
1. Use any USB Flash drive, format it to FAT32 (Important!)
2. Unpack usbrecovery.tar.gz to this drive (You will get "boot" folder and 4 files inside)
3. Plug this USB drive to WD MyCloud, turn on power. Wait yellow-red (blinking) light.
4. Connect via Telnet (Search IP in your router, unde DHCP section.)
5. Format HDD if need:
parted /dev/sda
mklabel gpt
mkpart primary 1049kB 2149MB
mkpart primary 8591MB -1MB
mkpart primary 7517MB 8591MB
mkpart primary 2149MB 3222MB
mkpart primary 3222MB 4296MB
mkpart primary 4296MB 6443MB
mkpart primary 6443MB 7517MB
q
mkswap /dev/sda1
mkfs.ext4 /dev/sda3
6. Install original WD recovery and reboot:
mkdir -p /mnt/usb /mnt/root
mount /dev/sda3 /mnt/root
mount /dev/sdb1 /mnt/usb
cp -r /mnt/usb/boot /mnt/root/
cd /mnt/root/boot
rm uImage uRamdisk
mv uImage-wdrecovery uImage
mv uRamdisk-wdrecovery uRamdisk
cd /
umount /mnt/root /mnt/usb
sync
reboot -f
7. After reboot device get old IP address and accessable via Web-GUI (Recovery mode). Use original firmware (.bin file) here.
Done!
=====================================
Alternative way:
Use Debian/ubuntu or any other linux distro (USB/CD Live image)
All "/dev/sda" change to your disk! (List disks in system: "parted -l")
If this is new disk or damaged (formatted) old, recreate partitions first:
parted /dev/sda
mklabel gpt
mkpart primary 1049kB 2149MB
mkpart primary 8591MB -1MB
mkpart primary 7517MB 8591MB
mkpart primary 2149MB 3222MB
mkpart primary 3222MB 4296MB
mkpart primary 4296MB 6443MB
mkpart primary 6443MB 7517MB
q
mkswap /dev/sda1
mkfs.ext4 /dev/sda3
Download and unpack files from https://drive.google.com/drive/folders/0B_6OlQ_H0PxVdU9QWURqTXpaenM - uImage-wdrecovery (https://drive.google.com/open?id=0B_6OlQ_H0PxVRzM2YjlQUE9KMkE) and uRamdisk-wdrecovery (https://drive.google.com/open?id=0B_6OlQ_H0PxVZGZRc3ZFdzh6bTg)
Write it disk:
mkdir /mnt/boot
mount /dev/sda3 /mnt/boot
mkdir /mnt/boot/boot
cp uImage-wdrecovery /mnt/boot/boot/uImage
cp uRamdisk-wdrecovery /mnt/boot/boot/uRamdisk
Done. Connect disk back to WDMC and turn on.
After few minutes WDMC boots to "WD Recovery". Go to webgui and upload official firmware.
Done!
