1. On the PS3 go to memory card utility, find your jak x save, press triangle, copy. select your USB stick as destination.
2. Plug USB stick into PC
3. Use [https://github.com/bucanero/psv-save-converter](PSV save converter) on your .PSV file on USB stick  - /PS3/EXPORT/savegamename.PSV - to export save to a .psu file. Drag your save files that are in .PSV onto the "psv-converter-win.exe" app. It will convert the .PSV save file into a .psu save file on the USB stick.
4. Use [http://www.csclub.uwaterloo.ca:11068/mymc/](mymc) <editor's note: using older version for easier gui usage, as for ++ i'm only seeing pipx install instructions> to open PCSX2 memcard file - typically in Documents/PCSX2/memcards/Mcd001.ps2. Import .psu save from the previous step. Save file and close app.
5. Start PCSX2, play final race, watch credits, let game save.
6. use mymc again on the pcsx2 memcard file. export save to a .psu file.
7. Use [https://github.com/bucanero/psv-save-converter](PSV save converter) on your new .psu file from previous step to export save to a .PSV file. Drag your save files that are in .psu onto the .exe app. It will convert the .psu save file into a .PSV save file
8. Put the new .PSV file on usb stick in /PS3/EXPORT folder.
9. Plug usb into PS3
10. Go to memory card utility, scroll up to usb stick. find your jak x save on the USB stick, press triangle, copy to memory card, overwrite old save.