I installed two S8300E blades with 8.0
I also tried to go 8.1 but went back to 8.
So now my lab core is 6.3.8 and 2 lsp's are on 8. AVP, AVPU and CM, all patched.
So if you are planning to go 8 get all the licenses first, place then on weblm then move all your LSP's and ESS's first.
Then you...