I wouldn't waist your time trying to mess with an updated firmware, there is nothing new in there you'd need to use, I'm sure the only changes in there have to do with the servers the
doorbell connects to. If you really want to make a difference and help us make some progress in this thread I would run the stock firmware, connect to shell over UART and start making changes in the Yosee app and see what it changes in the file system. The first place you could start looking is in
/rom/custom_setting.ini