I too hit the upgrade firmware option on my NK-1 and lost all the local control of the wifi network. All the wifi devices kept humming along, but since they were managed previously by the NK-1, I could not log in until they were upgraded. I checked with Eddie to see if I could downgrade the NK-1 firmware, and sounds like it is not possible - Pakedge really needed a warning on that upgrade - and no I did not review the release notes in advance!
After upgrading the firmware, the PW on the NK-1 changed to OVRC / OVRC, which was super confusing.
To help others, here is a quick set of steps to get your WK-1s and WK-2s back into management:
a. Setup an OVRC account
b. Add the managed location as a Customer
c. Add the managed devices to the Customer location - I added the MAC address of the NK-1. This then allows you to see all the devices on the network - specifically you will see the WK-1 and WK-2 devices. Unfortunately it also shows every other device so you have to find the Pakedge devices you want to manage.
d. Under Devices, click on each WK-1 / WK-2 and click the Update button which will upgrade their firmware
e. After updating them all, click WI-FI Management, and import all their settings, and change/update the settings as needed. Apply the settings and you are back in business.
f. The WK-1/WK-2 devices are then managed under WIFI Management, but some individual settings can be managed under Devices by hitting the Configure button. This includes Guest Networks which it looks like can only be managed by device at this time.
g. Then added 2 factor auth given that OVRC provides a complete window into the network that needs to be protected.