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The idea with the CMOS battery was not good - notebooks don't usually have one, sorry   I have a E2228 too with AMI BIOS. try one of the backdoor bios passwords: AAAMMMIII AMI?SW A.M.I. or try this: https://www.online-tech-tips.com/cool-websites/reset-bios-password/ ... View more

look here: https://www.makeuseof.com/tag/reset-bios-password/ if you have already opened the device, try this: take out the CMOS-Battery, wait some time (may be 1 minute), then attach it again.   good luck ... View more