EX6100 firmware upgrade corrupted by WiFi network change during update

After updating firmware a little window pops up "I have logged into extender network".  Big mistake to click on that window.  My PC had reverted to the parent router network (model R6300v2) during the firmware update.  Now it's impossible to log back in to the EX6100 by way of www.mywifiext.net.  The password from the R6300 is no longer recognized, and it won't accept the password "PASSWORD" either. 

This could be curtains for the EX6100 if the firmware update was aborted as a result of hitting the "I have logged into extender network" button when I wasn't logged into the extender network.  The extender is actually functioning, but it's impossible to log into the unit.  Anyone have any suggestion?