atmega328 HV Fuses Rescue

[EB5HDT]

If the chip is blocked or bricked, you just have to erase the fuses again and it is as good as new from the factory, for that you need specific hardware to do that, IT CANNOT BE DONE WITH THE CONVENTIONAL PROGRAMMER THROUGH THE ISP PORT, IT WILL NOT WORK, for many times that it is tried or said on the internet it will not work, an HV programmer is needed for the atmel. It takes a AVR High Voltage Programming nied.

https://www.instructables.com/AVR-High- ... es-rescue/

https://duino4projects.com/arduino-base ... rogrammer/

[EB5HDT]

important before programming the atmega 328 through the ISP there should be nothing in J7, J9 that correspond to PA, Mic / key, which as seen in the diagram correspond to the ISP pins cpu.

[TangoBravoMike]

This is an interesting idea, thanks for telling us about it. Have you actually done this on a surface mount device?

The articles you linked describe boards for resetting fuses on DIP (dual inline pin) devices. DIPs are much easier to deal with than a surface mount chip that's already soldered in place.

Is it possible to reset fuses using only the access available through the ISP header? If not, for our boards a fuse reset may be no easier than just swapping the whole chip.

There's the parts availability problem of course. I got quotes a few days ago for ATmega328PB -AU devices:
Heisener: $10 each
Barum: $8.75 each
or we can transplant a chip from
https://www.amazon.com/dp/B07X2JGS69 Clone of Arduino Pro Mini
or from several other 328p-based devices available on Amazon.

[ UPDATE 6/29/2022 : Apologies -- I was spreading bad information ! ! ] The "ATmega328p" chips on those cloned Arduino Pro Mini development boards appear to be clone chips rather than genuine ATmega328p devices. This was mentioned in another topic:
viewtopic.php?t=461 Broke my radio, part II
See the post by pe1nnz on 10 June 2022.

Thanks, 73,
Rich / AE8AA