Excellent
The procedure works. A few tips to smooth the path for those needing to do this.
TFTP software is just a boot server so this allows the Linkstation Pro to boot up without the HDD it doesn't actually fix it.
From what I can make out TFTP REQUIRES the computer to have to have the IP address of 192.168.11.1/24
Once the LS is booted use the firmware update utility to restore it.
The LS must be on the same network (i.e. 192.168.11.x) as the update utility for the update to work (it will find it but not update it).
The debug menu can be enabled by adding the following two lines to the .ini file:
[special flags]
debug = 1
This can then be used to configure the IP address as required (or you can use NasNavi )
When the LS is finally working again login to the web interface (the address can be found with NasNavi) and check the language is set correctly. There are threads to explain this better if my brief explanation is inadequate.
When logged in select (click) the second menu item on the left
On the screen that now comes up scroll to the bottom and you should have a pull down menu that say Japanese
Use this menu to select your language and then hit the grey button below it to apply the changes.
Note: my browser does not refresh the page properly so hit refresh a few times to get the page displayed in your language.