ICX 7750 Recommended Firmware

[cs_staffworld]

We have a pair of (Brocade) ICX 7750s working as our core routers (we are using MCT, BGP, OSPF, VRRPe). We are currently running firmware version 08.0.30h. We noticed that according to the support site, 08.0.30r is the recommended firmware version although 08.0.30sa is out and 08.0.80b says it supports this model. Is there a reason the recommended version is 30r? Is there any reason not to upgrade to 80b?

We think we might be affected by DEFECT000567305 which is fixed in 60a, so would it be better to just move to that version?

Separately, is there a reason the Release Notes for 08.0.40 are only available to Pro Support users?