if the BCC3 is in a peripheral cabinet (not a 200EL control cabinet, but a peripheral cabinet on a 200EL/200ICP/3300MXe) then you can plug a serial cable into the printer port of that cabinet (38400 - 8-n-1) and at least watch it boot and upgrade - it will upgrade and reboot 3 or 4 times before it is up. this will tell you what is happening and let you know immediately when an upgrade has failed.
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