My trusty old 4th gen finally died from water damage today. I never updated to iOS 6 so I had that original YouTube app that was amazing. I believe I had updated it to iOS 5 though but I don't remember. Anyway I am thinking of buying a used 4th gen online and wanted to know..... Is it possible for me to get back to using that iOS if I order another 4th gen? I really miss it already. I used it for watching YouTube and surfing gamefaqs when I was tired of my iPad.
Its not possible to roll it back, but you could find one with iOS 5 on it??
Perhaps you could get your current one repaired by a non apple repair place? Logic boards can survive water if fully dried out, usually its the battery that dies when an iPod gets water damage.
You could also get a 3rd gen iPod Touch as it could not update past iOS 5, so you're guaranteed to be able to have one with the youtube app on it.
Alternatively, have you tried some of the app store youtube clients? I find some far better than the google youtube app.
I also miss the Apple youtube App tbh!!