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How to restore original Sonoff firmware

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.

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I already asked,
Itead cannot offer the original Sonoff firmware, it's not open source and not for public.


Would this work to Backup and and later re-Flash original ESP8266 Firmware using

Also read about here : -

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I found this reference:
Copying and Cloning Firmware

 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. 

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