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Originally Posted by 1075guy

My guess on the Rev A/B thing is that HQ + Dlink/Cisco may have found a vulnerability or other problem that wasn't just limited to the method of the Einstein FCA attacks, one that couldn't be rectified in software alone, but that the Rev B hardware fixes.

That could be the case. However keep in mind that a huge number of consumer wireless networking products undergo numerous hardware iterations during their lifespan - I've seen Linksys, Netgear, and D-Link products go through 6 to 7 versions before being replaced by a completely new product/model number. Perhaps some of it motivated by cost reduction/efficiency improvements, some by security, some by performance/reliability improvements.