Lfuse seted 0xD9 -> Invalid device signature

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Hello all! I have accidentally upload lfuses on 0xD9 on Atmega328P (using this tutorial and wiring: DEC #14 Change Fuse bits and burn Arduino bootloader to atmega328 microcontroller - YouTube )

Now I cant change it back, because even if I just want to know fuses
(avrdude -c arduino -p m328p -P COM5 -b 19200 -v)
Arvdude gives me clasical message:( :

avrdude: Device signature = 0xffffff
avrdude: Yikes! Invalid device signature.
Double check connections and try again, or use -F to override
this check.

I have double checked the connections- not helped. Tryed to change baudrate - not helped. Do you think its because this low fuses? Is there any chance to safe my atmega? Should I use another xtal (now its 16 MHz) or cap (now 2x 22pF)?

Thank You very much, I was trying to study obout Low-Power Crystal Oscilator, but its too difficultfor me and I even dont know, if ist correct direction...

Best regards....

2

You have set the AVR to use a low frequency external crystal (< 1MHz) Since there isn't one connected, the clock isn't working and the AVR won't respond to programming commands.

You can fix it by "injecting" an appropriate clock into the XIN pin.
See https://www.avrfreaks.net/forum/tutsoft-recovering-locked-out-avr

3

Ok, thank you for response and link. I will try and let know! BR

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