As far as I can tell the upgrade process goes as follows:I upload new firmware onto the ZD, save the config file, click upgrade, ZD does it's thing and restarts. After the reboot ZD is up and running and all APs are in disconnected state instead of 'upgrading firmware'.
And to answer your questions Monnat Systems:
I cannot what the DIR led status is like as I have only done the upgrade remotely while being offsite with no physical access to the APs or ZD.
I am unable to ping any of the APs after upgrading ZD. .
All APs are on layer 3 network, same subnet as the ZD.
ZD restarts itself after upgrading the firmware, all subsequent restarts were done hoping that the upgrade will somehow kick in after rebooting ZD.. I have had issues with 1-2 random APs in the past, also after an upgrade, where they would be in disconnected state, but after rebooting the ZD they would upgrade just fine.
It almost looks like configuration of all IPs resets itself after the upgrade. That could explain why I cannot ping any of them. As soon as I revert to the previous firmware and restore the config, everything goes back to normal.