I have a SG500-52P Switch with 1000BASE-BX-20U SFP (SKU: MGBSX1)  and we purchased a new Nexus 3524 Switch that has 10G SFP+ (SKU: SFP-10G-SR).  Can I interconnect these two switches? Any compatibility issue?  We will be uninstalling the SG500 after ...

I have a few B2000M3 servers that have firmware 2.0 (3c).  I would like to upgrade to 3.1 (1e).  Can I jump from firmware 2.0 (3c) straight to 3.1 (1e)?  Or do I have to go to 2.1, 2.2, 3.0, then 3.1?  Please advise.  Thank you.