Miraculously I have made progress with this. After reading a number of articles in this forum, I managed to successfully dump the save files from the USB pen drive I backed the save games onto using the Wii U inbuilt backup software, even though I performed a system restore on the Wii U after I backed up the saved games.
What worked for me was to:
- Run the nandumper program on the Wii U to extract the files to an SD card, then take a copy of otp.bin and seeprom.bin,
- Apparently each time you do a system restore of a Wii U, there is a counter in the seeprom.bin file that gets incremented by 1,
- I used the HxD Hex Editor to edit the seeprom.bin file and subtract 1 from the final byte of the 000000B0 row:
- Saved the seeprom.bin file and ran the wfs-extract command with the syntax I used in my earlier post and the save files were dumped to my PC's hard drive.
Now my next step is to load the saved game files from my PC back to the Wii U. From what I have read it looks like this should be possible using the "wfs-file-injector" program. Is that correct? Are these the the correct steps to do thi:
- Load the game I want to restore the saved game for onto the Wii U,
- Launch the game then save the game progress,
- Copy the saved game to a new USB pen drive inserted into the Wii U using the Wii U inbuilt backup software,
- Plug the new USB pen drive into my PC then use "wfs-file-injector" to copy the previously backed up save game from my PC to the new USB pen drive,
- Insert the new USB pen drive back into the Wii U then restore the saved game state to the Wii U from the USB pen drive using the inbuilt Wii U backup software.
Is that correct, or is there a different/easier way to achieve this? Many thanks in advance for any help provided.