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I have read lots about how to replace the original firmware and I might try some of these suggestions, but I really like the factory software and would want to restore it after my experiment. Someone please explain how to do this.

Would this work to Backup and and later re-Flash original ESP8266 Firmware using esptool.py?

https://www.youtube.com/watch?v=PycRnjcXMRI

Also read about esptool.py here : -

http://tech.scargill.net/itead-slampher-and-sonoff/

 Of course I haven't confirmed this works.  I'd probably test something like this on an esp8266-01.  Take a snapshot of what's on it, upload some other firmware, then try restoring the original and see if it works.