In the FAQ section it says we can restore to original Linksys firmware by refreshing the firmware download area and selecting the appropriate Linksys firmware etc. Now that I'll be upgrading my mesh ambitions to Ubiquity, it would be nice to return these WRT's to their original purpose but the firmware downloads don't include the advertised packages.

ETA:

I guess I should have looked into this a bit further... it appears that others have addressed this issue on the firmware page.