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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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Lenovo Ibm X220 X230 X301 X220t Motherboard Cmos Bios Battery - Laptop Repair Components - AliExpress
Boot entries keep accumulating / ThinkPad X220 does not wake up from suspend-to-ram · Issue #52 · rhboot/shim · GitHub
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