0. Reset the ASUS to the factory firmware. Turn off the router and hold the reset button in while powering it back on. Stopping pressing the reset button after the power light blinks.
1. Download the firmware which works with the ASUS RT-N10 router. The main Tomato download page is located at http://tomatousb.org/download Look for the link to the Older Firmware Versions. I used the following firmware http://sourceforge.net/projects/tomatousb/files/Rotten/tomato-K26-1.28.9052MIPSR2-beta23-Std.rar/download
2. On your linux box, install tftp.
# yum install tftp
3. Turn off you network interface
# ifconfig eth0 off
4. Plug Ethernet cable from Linux box into one of the LAN ports on the ASUS RT-N10.
5. Turn on Linux Box network interface
# ifconfig eth0 192.168.1.2 on
6. Flash the ASUS RT-N10
# CD <directory where firmware is located>
# unrar e tomato-K26-1.28.9052MIPSR2-beta23-Std.rar
# tftp 192.168.1.1
tftp> binary
tftp> put tomato-K26-1.28.9052MIPSR2-beta23-Std
When the tftp> prompt returns, the firmware has been pushed to the router. There is no response from the router to indicate the firmware has completed loading. I waited about five minutes, then powered cycled the router.
On boot-up I hit the router via the url http://192.168.1.1 I was presented with a menu about clearing the NVRAM, which I selected and the router started rebooting. I waited about a minute and hit the URL again, and was presented with the Tomato Web admin page. The default username was admin and the password was admin. Be sure to changed after logging into the router.
I configured my router as wireless ethernet bridge. I followed the guide at http://www.wi-fiplanet.com/tutorials/article.php/3810281/How-to-Set-Tomato-Firmware-for-Wireless-Client-Modes.htm
I have not tried any other firmwares or updates.
