b1 or b2 n66u?

[N66uASUS]

how do i tell if my n66u is b1 or b2?

 

[KevTech]

Look at the top line of the label on the back of the router.

 

[elytron]

I have a question. How is an RT-N66U version b2 improved over b1? Any major differences in the hardware? Is one hardware version superior over the other?

 

[RMerlin]

AFAIK, one of the differences is they are using a different manufacturer for the flash chip. Beyond that, no idea what else was changed.