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Download and install the Lenovo Thinkpad T420's wifi driver bellow for free to get full performance. The List of Compatible OS Windows for Lenovo Thinkpad T4 2 0 Wifi Driver Windows 8.1 32 & 64 bit.
Description: The original set to recover Windows 7 Professional 64 bit SP1 consists of 3 DVD discs 0A44006, 0A40707 and 0A40733, Laptop Lenovo ThinkPad T420.Type Model: 4177, 4178, 4236, 4170Compatible with ThinkPad T420s (4170), tested by me personally, it works 100%.Data recovery disks supposedly fit all models of ThinkPad x200s, x200, x201, x220, x301, T400, T500, T410, T420s, T510, T520, W500, W510, W520,Lenovo E120, E420, E520(after installing the utility you want to run home updates from Lenovo - ThinkVantage ™ ® System Update, all of the missing drivers will be installed automatically).