Canon w8400 firmware error when put new printhead in

[keyweb]

Hi i have read a few threads on how to do this, i have got the L print software, have conected to printed, all great go to select a older version of the firmware to roll back to before putting new print head in but cant find any old versions in the data folder?

I can old get hold of the current 2.15 version, i imaging i need 2.12 but cant see it on line or any original discs

please help