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X220 supervisor password clear (short top 1 and 2 + bottom 3 after F1 beep to bypass password and to set an other one) : r/thinkpad
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Unlock #T440,#T450,#T460s,#T470s,#T480s,#X1Carbon gen2/8,#X270,#W540 #Unlockibm #Computrace #Lock - YouTube
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Lenovo ThinkPad T440p / T440s/ T540 / E440 / E540 unlocked BIOS menu / wlan / wi-fi whitelist mod - Lenovo - Tech|Inferno Forums
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