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Success on TL-WR741ND V4.2
Tested on 1.5.9 with no problems so far. I added the 13 channel fix for Europe.
<shell> ssh root@openwrt
cd /tmp/ wget http://luci.subsignal.org/~jow/reghack/reghack.elf chmod +x reghack.elf cp /lib/modules/*/ath.ko . cp /lib/modules/*/cfg80211.ko . ./reghack.elf ath.ko ./reghack.elf cfg80211.ko mv *.ko /lib/modules/*/ reboot </shell>