TDK now has the 1.06 firmware available on their website. The 840G is pretty much a rebranded PX-708A, and the firmware is identical. The official release will help out those who do not know how to modify the Plextor INI file to update their TDK recorder.
Could you please give us a link to the download page or a direct download link?
Here is TDK’s support page for the 840G:
IlAl2ieLlI already posted the direct download link for the firmware.