I have one rb535, two rb133c and one rb150 failing after the said upgrade.
These boards are not even accessible by netinstall anymore. I can boot 3 of the boards through netboot server over the ethernet. After that the netinstall program manages to erase the nand but the upload of the new packages (or even old versions) fails. So you understand, after that the nand is empty (formatted) so the boards are completely useless.
During the same week I ran into the problems with these failing boards I actually also upgraded over 70 boards, most rb133c, a handfull 532's and 112's, all in a production environment and they are all OK after the upgrade.
I had upgrades from several versions of 2.9.x into 3.2 and even two rb133c units from 3.0 to 3.2. Both had exactly the same config, both were update wireless and one failed afterwards while the other had no problem whatsoever.
IN the rest of the field I had several firmware versions running but like said, I hardly had problems.
All the 'field' units were updated by ftp over the wireless and as said, only one Client CPE rb133c failed after that.
So it looks to me it's not a common problem, but to high in occurance to call it a 'rare' event.
And one that doesn't make me too happy
I have had several suggestions from MT now to solve the problem but so far no luck. I'm expecting, and waiting, for their next moves.
I was lucky my boards were on my desk and only one in an easy accessible lproduction side.
Rudy