Linksys WRT54G v8.1
From DD-WRT Wiki
NOTE: During configuration or flashing a device, the only that should be hooked to the device is the computer and power.
The WRT54Gv8.1 router already has a Linux CFE in the flash. There is no need for running any prep or killer file before the initial flash.
This model also has a 128K compressed CFE so it will load micro_plus and micro_plus_ssh directly. Initial flashing of this model requires a modified file with the proper header. You can obtain this file here. After this file is loaded you can then upgrade to any micro_generic.bin file....or one of the micro_plus, micro_plus_ssh mentioned above.