As Markus Baertschi wrote:

> Got message seqno 1 (command_sequence == 1)
> response: AC
> set paramater command failed

0xAC is "RSP_DEBUGWIRE_SYNC_FAILED".  Kind of surprsing since
apparently, AVRDUDE can at least talk some debugWIRE with your device.

Is your /RESET pin going straight to the ISP cable and nothing else?

Do you have not more than ~ 10 cm of ISP cabling?

You could try attaching a pullup resistor of 4.7 kΩ or 10 kΩ to
/RESET, this sometimes improves the debugWIRE communication
reliability a bit.

-- 
cheers, J"org               .-.-.   --... ...--   -.. .  DL8DTL

http://www.sax.de/~joerg/                        NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)

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