Upgraded firmware to Mk4 but now no motor movement
I followed the instructions for upgrading the firmware to version Mk4. Now the motors do not move. If I press the switch I get no pulses that I can feel like I did before the upgrade. I tried applying the firmware twice and both times it was successful per the instructions. I would like to downgrade to the Mk3 to see if it fixes it but I cannot locate the files unless it is the Mk2 version. Please advise.
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Bill when I try thr burn Bootloader I get this error
Arduino: 1.8.19 (Windows 10), Board: "Arduino Uno"
avrdude: Error: Could not find USBtiny device (0x2341/0x49)
Error while burning bootloader.