recoveryname - the path to and filename of the image to flash
“Flashing” as a concept (and the origin of the name) goes back to the first EEPROM (Electronically Erasable Programmable Read-Only Memory) chips, which you programmed by literally flashing light onto it. UV maybe, no, think it was infrared? I forget, this was back in the 80’s, and EEPROM flashing was done with a little box with the light source in it with a holder for the EEPROM package.