admin pass - bios HP EliteBook8540p

[synstar]

password I have created two years ago after purchasing the HP EliteBook 8540p, now I need to get into bios because they want to sell it but I completely lost my password, already inscribed with 1000 combinations and nothing, can someone help?
can smoogy?
HP EliteBook 8540p
serial: CND0281G27
(4 - ZERO)

[syntax error]

try taking the bios battrey out, or just flash the bios

[fl3xy]

i was call to HP support then i must send email with document from shop where i was buy this and then give me password generate using some keys on keybord

[synstar]

try taking the bios battrey out, or just flash the bios

not working