What is a Device Firmware Reset in iPhones?

[rodion15]

According to the iPhone service guide:

"A Device Firmware Reset may resolve an issue that caused the device to not turn on and all other attempts have failed."

What does a Device Firmware Reset do? erase then reinstall the firmware?

 

[learninmypc]

According to the iPhone service guide:

"A Device Firmware Reset may resolve an issue that caused the device to not turn on and all other attempts have failed."

What does a Device Firmware Reset do? erase then reinstall the firmware?

Have you ever thought of using google to search?

 

[fastco]

Yes it resets the phone back to factory settings and erases all content.