Extract Boot Files from Stock Firmware

 Download the firmware for your device from Buffalo's site Unzip the firmware file and locate the directory containing LSUpdater.exe or TSUpdater.exe locate the correct initrd.img and uImage.img for your device (usually there is only one, if there are more they typically include the corresponding device model in the name) These files are actually password protected zip files, the password will be one of the following: 1NIf_2yUOlRDpYZUVNqboRpMBoZwT4PzoUvOPUp6l aAhvlM1Yp7_2VSm6BhgkmTOrCN1JyE0C5Q6cB3oBB YvSInIQopeipx66t_DCdfEvfP47qeVPhNhAuSYmA4 IeY8omJwGlGkIbJm2FH_MV4fLsXE8ieu0gNYwE6Ty Source: https://web.archive.org/web/20180525041523/http://buffalo.nas-central.org/wiki/Firmware_password  unzip initrd.img, it should contain initrd.buffalo. It might have a slightly different name, if so rename it to initrd.buffalo unzip uImage.img, it should contain one or more uImage files. If there are more than one rename the one for your device to uImage.buffalo (this may require trial and error to determine) 

These files can then be used to boot the device into Emergency Mode as described in:
 * Restoring_Stock_Firmware_via_TFTP
 * Restoring Stock Firmware without TFTP