I have Arduino Sketch for
standalone uploading hex file from SD Card to other Arduino or chip
No computer needed ! Using only Arduino
But I'm having problem that this sketch upload and flashes only one [login to view URL] after pressing a button D2 to Gnd of Arduino
It supposed also upload and flashes multiple files it has encoder rotary to choose the file number you want to flash from SD card to the target chip or other Arduino
I need someone to do it.