I now suspect your device is of a later type than i initially thought, so maybe uses the path "2:/" rather than "1:/" to write to an inserted media card.

Every targeted large "rrgn" command failed with error but maybe "reboot" was successful .... Did it reboot itself, or did you have to eventually turn it off manually? If it did execute the final command itself, try with this: [Only registered and activated users can see links. ].

Remove both current update.txt and last_id.bin from 1982 folder. Add the above file to it then follow the guide in P#7 again. Be sure to remove last_id.bin or the commands will be ignored. You can leave "update.log" in place or remove it, the device will re-create it anyway if it's not present or add to it if it is present.