3.3 to 3.5 kills radios?

Take a read through this if you have not already:

http://community.cambiumnetworks.com/t5/ePMP-2000-and-1000/Lost-access-to-2000-AP-during-upgrade-to-3-5/m-p/77332#M11545

I am getting convinced there is an issue with the 2000 AP hardware, firmware 3.5, Netonix switches when the AP has STP turned on. I have three 2000 APs and all three of them I lost control of on the Ethernet side when I tried to upgrade to 3.5.  All three are in Netonix switches and all three use STP.  As a result, I have not upgraded those APs.

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