Linkstation LS420D

Variations
Comes in the normal "D" variety as well as the "NVR" version which comes with different firmware.

Stock Firmware Installation
Restoring_Stock_Firmware_without_TFTP

Custom Firmware/Operating System installation
Installing Debian on Armada-370 Devices

Disassembly

 * Remove both screws from the back
 * Slide cover back then remove

Buffalo Resources

 * Product Description
 * Manuals, Firmware, etc