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Amazon.com: Zahara Bios CMOS Power Replacement for Lenovo ThinkPad T400 T400s T410 T410s T420 T420s T430 T430s (5 Pieces) : Electronics
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Windows 7 Clean Installation - ThinkPad T420, T420s, T520, W520, X220 and X220 Tablet - Lenovo Support SG
![I installed a new wlan card in my t420. is there some bios update I need? my old one was acting up but worked sometimes. it works if i plug the old I installed a new wlan card in my t420. is there some bios update I need? my old one was acting up but worked sometimes. it works if i plug the old](https://i.redd.it/v8kae7k58t581.jpg)
I installed a new wlan card in my t420. is there some bios update I need? my old one was acting up but worked sometimes. it works if i plug the old
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