Why are there two different OpenWRT firmwares for the LinkSys WRT54G3GV2-VF?

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http://unix.stackexchange.com – The stable version of OpenWRT (10.03.1) does not work on the LinkSys WRT54G3GV2-VF. The WiFi doesn't work, there are various bugs on trac that say it's fixed in trunk. However if you browse the download locations, there are two different files for this router with no explanation as to why: For the unreleased stable version 12.09: (http://downloads.openwrt.org/attitude_adjustment/12.09-rc1/brcm47xx/gene...) openwrt-wrt54g3gv2-vf-squashfs.bin openwrt-wrt54g3gv2-vf-squashfs.noheader.bin And in the bleeding edge folder: (http://downloads.openwrt.org/snapshots/trunk/brcm47xx/) openwrt- (HowTos)