As István Rétallér wrote:

> avarice -d -2 -r -P at90usb162 -j usb

The AT90USB162 does not have JTAG.  You have to use debugWIRE for it
-- which involves fuse toggling, and if your configuration cannot talk
debugWIRE at all (e.g. since you've got too much capacitive load at
/RESET), this fuse becomes one-way street.  (In order to turn that
fuse off, you have to talk debugWIRE first, to re-assign the /RESET
pin as reset again, so you can talk ISP.)

That's the reason why AVaRICE does not touch this fuse by itself, so
you have to program it manually in AVRDUDE.

-- 
cheers, Joerg               .-.-.   --... ...--   -.. .  DL8DTL

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

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