On my Arduino Uno R3 clone I cannot upload anything anymore nor an old program is running. The reset button do not have any effect and the L (yellow) led is constantly on.
What I did was buying a USBasp for debugging purposes and uploading my sketches using it from Arduino IDE and Atom Platformio. There was a warning that sck? was always 0 and I should upgrade the firmware of USBasp. But internet said I should just ignore this warning and actually the uploaded sketches worked fine.
However for debugging I switched from Linux to Windows 10 and tried to make Atmel Studio work unsuccessfully, then Platformio for Windows successfully. But I ended up that my Uno is now bricked. I don't know what happend. It s
Now I cannot upload anything and the L led is always on. Searching the web said this could be a bootloader curruption, but I also cannot flash a bootloader. This error message comes:
avrdude: auto set sck period (because given equals null)
avrdude: warning: cannot set sck period. please check for usbasp firmware update.
avrdude: error: program enable: target doesn't answer. 1
avrdude: initialization failed, rc=-1
avrdude: AVR device initialized and ready to accept instructions
avrdude: Device signature = 0x88abe1
avrdude: Expected signature for ATmega328P is 1E 95 0F
The loopback tests fails.
Any ideas how to unbrick?