Rescue AVR MCUs with wrong fuse settings
Use high-voltage programming to correct wrong fuse settings in AVR microprocessors
Do you have Atmel MCUs with wrong fuse settings that are not usable any more? This project can help to resurrect these chips. You need an Arduino board, a breadboard, two transistors, a few resistors, a lot of jumper cable, and an external 12 volt source.
The Fritzing sketches show how to connect the Arduino board to the MCUs and how to set up a 12 volt switch. I cover only the ATtinyX4, ATtinyX5, and ATmegaX8. For other MCUs, you have to consult the data sheets.