Problems with logging directly in to RBW30

Problem: Bought a used ORBI RBW30 satellite through eBay to add to my existing mesh network, and could not log in using many combinations of "default" passwords.  This also was preventing me from updating the RBW30 to the newest firmware 

Solution:

Step one: perform a factory reset on the RBW30 (press reset button with an unfolded paperclip until top light blinks amber). 

Step two: add satellite to mesh network following instructions in the manual.  

Step three: Connect to the satellite RBW30 using a web browser directly.  The default username/password (i.e. "admin/password") now works, but the more secure password I have on my router and existing satellites did not.  But if you got this far, keep going!

Step four: manually update the firmware directly on the satellite. This means manually downloading the zipped update from Netgear, extracting the files to a folder, and surprisingly,  renaming the .chk file to an .img file prior to updating.  Don't ask me why, and Netgear doesn't warn you about it.

Step five: Password fix:  When all the satellites are connected, including the new one with the latest firmware, log into your main router from a web browser and click Advanced Tab, then Administration -> Set password.  Enter your EXISTING (and presumably secure and safe) password into the three fields: "old password" ,"new password", "repeat new password".  Click "Apply".  Voila, the password should get forced onto the new RBW30.

Comment: the "fix password" last step may also be replaced by rebooting your main router; that too may force the password to the satellites - but I didn't test that and it seems a lot more disruptive.