1. Upload all to any folder on WDMC
2. Run:

dd if=boot-to-recovery.env of=/dev/sda7
dd if=recovery.img of=/dev/sda6
reboot

3. Device will reboot to recovery. When you see green light - you can connect via Telnet.
4. After login you can run md0 (or md1) and do what you want:
mdadm -A /dev/md0 /dev/sda1 /dev/sda2
# or
mdadm --create /dev/md0 --level=1 --metadata=0.9 --raid-devices=2 /dev/sda1 /dev/sda2

5. Files boot-md0.env and boot-md1.env needs for back to normal boot (If you dont overwrite rootfs or kernel partitions).
dd if=boot-md0.env of=/dev/sda7