I am having a problem with my ATTiny85. I should mention I use Arduino as an ISP to program it.
My ATTiny worked fine until I decided that I need to step up the clock speed from 1MHz to 20MHz so I selected ATTiny85 at 20MHz from the Boards menu and then clicked on Tools>Burn Bootloader. But that was stupid, since now my ATTiny doesn't work at all. I cannot upload sketches on it and if I try I get this message:
avrdude: Yikes! Invalid device signature. Double check connections and try again, or use -F to override this check.
So my question to you would be, is there a way to reset what I have done? Or even better, to make it work at 20MHz?