I'm sure you've already seen this but in case you haven't:
http://wiki.openwrt.org/doc/howto/generic.flashingYou might consider flashing over ethernet vs usb using the bootloader option. I haven't done this on the Avalon but IMO it is a superior method of flashing routers with less chance of bricking.
I wasn't going to flash from usb, I was going to use USB as secondary storage.
It is a v 1.7 device that says v 1.6 on the outside label.
It is running the latest Avalon OpenWRT + mods system. It is just a test-bed / sandbox / backup.
The 32 Mb is mostly filled up. I vaguely think if the filesystem is moved to a 16 GB USB-Flash, I will have more room to play.
I want to do some things that are not supported by Avalon, such as add IPv6 support. Also, a 300 MHz MIPS processor with 16GB Flash-disk and 32 Mb RAM is an impressive little machine, even if it does cost pocket money and fit in the palm of the hand.