Trouble Installing Bootloader on Sony NW-A16

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I've spent the last few hours trying to find a way to install rockbox on an old Sony NW-A16 according to the instrctions at the link below.

https://www.rockbox.org/wiki/SonyNWLinuxPort

After downloading, renaming and copying the bootloader_nwza10_v1 file to my player and then issuing the command "sudo ./scsitool_64-nwz-v27 /dev/sdb do_fw_upgrade", the player restarts. On startup I get a screen which says "本体ソフトウェアをウップデートできませんでした。”　("Failed to update the software on this machine.").

If anyone could offer any advice then it would be greatly appreiated!