I have a ipod touch version 4.2.1 and it wont let me upgrade?

A second generation iPod touch can't be updated past 4.2.1.

(82491)

Sounds like you have a 2nd generation unit, which can not be upgraded beyond 4.2.1. Check the model number on the back, if it is A1288, it is a 2nd generation.

That is a second generation iPod touch.

(82494)

I wonder how often i have to write this:

"A 2G iPod can't be updated past 4.2.1!"