It's not a US issue - Sony Canada and UK don't have updates beyond 2014.
https://www.sony.co.uk/electronics/s...-series/prs-t3
https://esupport.sony.com/CA/p/model-home.pl?mdl=PRST3
It's been a while since Gingebeardman posted in his thread about the store issue - I suppose he hasn't heard anything further from Kobo.