Wireless equipment, like many other consumer electronics, comes with hard-to-alter firmware that is preinstalled by the manufacturer. When the Linksys WRT54G series was launched in 2003 with an open source Linux kernel as firmware, it immediately became the subject of hacks and became the most popular hardware among community wireless volunteers. In 2005, Linksys released the WRT54GL version of its firmware, to make it even easier for customers to modify it. Community network hackers experimented with increasing the transmission power of the Linksys WRT54G or increasing the clock speed of the CPU to speed up data transmission.