It seems that I’m missing a “-F” here.
What I sent
sudo avrdude -c usbasp -p m644p -U flash:w:firmware2.1.5.hex
what I’m supposed to send
sudo avrdude -c usbasp -p -F m644p -U flash:w:firmware2.1.5.hex
I suspected this since an answer was;
> Double check chip, or use -F to override this check.
Should I “force” the command ?
@ cuteboi I already wrote the lsusb outcome in my first post
From avrdude masnual
-F Normally, avrdude tries to verify that the device signature
read from the part is reasonable before continuing. Since
it can happen from time to time that a device has a broken
(erased or overwritten) device signature but is otherwise
operating normally, this options is provided to override
the check. Also, for programmers like the Atmel STK500 and
STK600 which can adjust parameters local to the programming
tool (independent of an actual connection to a target con‐
troller), this option can be used together with -t to con‐
tinue in terminal mode.