for web flashing use the whrag108-firmware.bin to upgrade a already installed dd-wrt using the webinterface. 1. mount a serial adapter to the device (max323 converter needed) there are 2 sockets on the board. the second smaller one is the serial console we need (JP1) pin 1 = rx pin 2 = tx pin 3 = GND pin 4 = GCC +3V 2. set your terminal client to 9600-8-N-1 3. enter the RedBoot console by pressing CTRL+C 4. copy root.fs and lzma_vmlinus to your tftp server directory 5. configure the RedBoot bootloader IP and TFTP server settings using ip_address -l [local ip address] -h [remote server address] 6. flash the unit by entering the following commands RedBoot> fis init About to initialize [format] FLASH image system - continue (y/n)? y *** Initialize FLASH Image System Warning: device contents not erased, some blocks may not be usable RedBoot> load -r -v -b 0x80041000 root.fs Raw file loaded 0x80041000-0x802c1fff, assumed entry at 0x80041000 RedBoot> fis create -b 0x80041000 -f 0xbe050000 -l 0x002a0000 -e 0x00000000 rootfs RedBoot> load -r -v -b 0x80100000 lzma_vmlinus Raw file loaded 0x80100000-0x801af797, assumed entry at 0x80100000 RedBoot> fis create -r 0x80100000 -e 0x80100000 -l 0x000d0000 -f 0xbe2f0000 linux RedBoot> fis create -f 0xbe3c0000 -b 0x80041000 -l 0x00010000 -e 0x00000000 nvram if everything went well it should look like this: RedBoot> fis list Name FLASH addr Mem addr Length Entry point RedBoot 0xBE000000 0xBE000000 0x00050000 0x00000000 RedBoot config 0xBE3DF000 0xBE3DF000 0x00001000 0x00000000 FIS directory 0xBE3D0000 0xBE3D0000 0x0000F000 0x00000000 rootfs 0xBE050000 0xBE050000 0x002A0000 0x00000000 linux 0xBE2F0000 0x80100000 0x000D0000 0x80100000 nvram 0xBE3C0000 0xBE3B0000 0x00010000 0x00000000 7. configuring the bootloader RedBoot> fconfig Run script at boot: true Boot script: Enter script, terminate with empty line >> fis load linux >> exec >> Boot script timeout (1000ms resolution): 3 Use BOOTP for network configuration: false Gateway IP address: 10.50.2.1 Local IP address: 10.50.2.109 Local IP address mask: 255.255.255.0 Default server IP address: 10.50.2.107 Console baud rate: 115200 DNS server IP address: GDB connection port: 9000 Force console for special debug messages: false Network debug at boot time: false Update RedBoot non-volatile configuration - continue (y/n)? y note that the ip addresses can be configured by you. these are only examples from my configuration 8. rebooting RedBoot> reset consider to configure your terminal to 115200-8-N-1 now. otherwise you will not see any bootmessages