There is a hard reset procedure, the user ckolivas describes it earlier in this thread. The instructions are also available from OpenWRT and TP-LINK on their respective websites. Note that this does not restore the Avalon factory configuration, but the base installation for the WR703N to function as a router. You will need to donwload and flash Avalon config (erroneously referred to as "firmware") from either ckolivas web repository or the Avalon wiki.
I found the post by ckolivas.
1. I set my computer to 192.168.1.2
2. I powered on the Avalon Unit and waited for the blue router light to blink and then hit the reset switch so the light blinks fast
3. Plugged in the ethernet cables
4. Tried to ssh to 192.168.1.1 - Connection timed out
I can ping and I get response.
If I telnet to 192.168.1.2 i get @root(none)
Any ideas? I'll happily pay anyone who can get my minier back up!
Thanks!
Try looking at the hard reset guide on OpenWRT website, or for the Tp-Link unit. ckolivas is unlikely to have got the details wrong, but he's not (quite

) a perfect android! A starting place is to check that the IP set on your computer is definitely changed to what you set, type ipconfig on Windows command prompt or ifconfig in Linux bash. Then check the guides to confirm that the Avalon router definitely changes to 192.168.1.2, if that's wrong then you'll never re-flash successfully ssh-ing into a non-existent IP.
All the usual computing troubleshooting advice applies: keep reading, keep trying, be methodical, don't change more than one setting at once, follow all crucial steps except your changes if you have to go back to the start etc etc