HyperWRT was a GPLfirmware project for the LinksysWRT54G and WRT54GS wirelessrouter based on the stock Linksys firmware. The original goal of the HyperWRT project was to add a set of features—such as power boost—to the latest Linux-based Linksys firmware, extending its possibilities but staying close to the official firmware. Over time, it continued to be updated with newer Linksys firmware, and added many more features typically found in enterprise routing equipment.
Like most other third-party firmware, HyperWRT is not compatible with the later (2006) WRT54G v5.0 ("CDFB" serial number prefix) and WRT54GS v5.0 ("CGN7" serial number prefix). These model versions do not run Linux by default, although you may use vxworks-killer firmware images to run stripped down linux versions like "dd-wrt.v24_micro_generic" or replace the flash memory 2MB chip with 4MB. Linksys currently produces WRT54GL for running 3rd party firmwares. Also, like most other WRT54G third-party firmware, it is assumed that power settings higher than 62mw would be used for long range internet use at the "B" speeds that are more tolerant to noise. Furthermore, its true of power boost firmwares that every time you double the output power, you get 3 only decibels more and in only one direction; therefore, a more efficient antenna (that also helps reception) can be more effective at long range than a power boost alone.