I’m having the same issue as reported by @squarepxl , I can’t change DEVELOPER mode anymore. I tried to turn off to test the process and I got the same error MSG:
“DEveloper is not registered”, but I used this, turned on and off several times in past and it worked so far. I’m on latest firmware and using Ricoh Theta desktop application on windows, seems the same issue as on Mac, this may be related to ricoh site, probably there is a request going from app toward ricoh site to verify registration, but it doesn’t work anymore.
Could you help please what to do? This me be an overall/global issue? I tried using 2 Z1 cams and verified the serial number for both is there on ricoh profile visible for me…