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Dell venue 8 pro wifi, not compatible with ar71xx routers

Just got my dell venue 8 pro today. found out wifi disconnected in couple minutes.

I did lots of search and find this:

http://en.community.dell.com/support-forums/mobile-devices/f/4586/t/19532482.aspx

they said it’s due to 2 windows update (KB2903939 and KB2887595),  however, I did not install those updates, my wifi still disconnected after few minutes.

tried install thosed updates and other settings, none of them works.

 

finally, I tried a differnet router, bing ! wifi connected and will not disconnect anymore. even with KB2903939 and KB2887595 installed.

the funny things is, the incompatible router was a ar71xx based router running Openwrt on it( this wifi chip on venue is DW1538 WiFi/BT, which made by Qualcomm Atheros), which is also make by Qualcomm Atheros.  The one working is a BCM based router running tomato on it.

 

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