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bios password on lenovo x240

How can remove
bios password on lenovo x240
Dump bios file does not contain passwords,that are in the KBC chipset.
from 3rd generation or earlier,password contained on PCA24s08 .
About X240;T440 ;T450 ..No tools currenly reading,now.
BTW,may be change chipset KBC.
 
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i am getting password in this bios , if i use another file it is not asking password
i am quit sure kbc not reserved any password in my laptop
 
the password is in the mec 1633L but not in the dump exact ... is on the eprom 1K
 
the password is in the mec 1633L but not in the dump exact ... is on the eprom 1K
how to read this 1k eprom? i do reprograming the mec1633l, but its still there. i mean password still pop up.
 
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