"Factory resetting" means restoring a device, like a phone or computer, to its original factory settings. It erases all the personal data and changes made, returning it to the state when it was first purchased.
Sentences with «factory resetting»
I tried to do factory reset after updated to 4.4, but the issues still remain. (goodereader.com)
But you will have to apply an extra factory reset process for your device to be able to boot in normal mode. (android.gs)
It may simply say «perform factory reset». (lifewire.com)