The link for the 2.8.1 firmware here was:
http://download.kobobooks.com/firmwa...date-2.8.1.zip
Edit: I tried the usual Kobo4/Kobo3 and there does not seem to be a Kobo3 version.
Edit Gen2: This should be for the Aura/Glo/Mini/new Touch (N905C) though I have only tested it on an Aura.
Regards,
David