WIFI problem ics 4.0.4

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http://forum.xda-developers.com – i have an unlocked at&t nitro hd and i use it in an asian operator every thing was good until i decide update it to the new official ics 4.0.4 now when i wana conect to my wifi network it didnot show any wifi access point i did factory data reset but it didnot work once again i did a factory reset without sim card the phone setup wizard show my wifi and works great i test every thing wifi was working great then i put the simcart in the phone and turned it on wifi was working in start up but when the phone conect to the operator and show the name of operator the wifi (HowTos)