|A legitimate owner is extremely unlikely to forget a system access or hard drive access password that they had to use every time they used the laptop. |
If the seller claimed he forgot it, the laptop was probably stolen.
"I allready checked these ways which don't work:
- "pharell loopback" - made it myself"
"- bios battery
- jumper for clearing of cmos setting "
The passwords data is not stored on the bios chip on modern laptops (those newer than about 13 years old) . It's stored on a separate chip that's soldered into the mboard that cannot have the data on it cleared by removing the power to it.
"- imposible... don't know how to flash the bios if I dont have a 1.44 flop and theres no boot"
You can't flash the bios if the laptop has a system access password you don't know - one that must be entered to use the laptop at all. The password data is not stored on the bios chip.
"- no backdoor passwords work "
They don't work on modern laptops. or at least, I've never heard of any that do. .
"- some hardware specialists were flashing the password chip, and nothing helped "
Obviously they didn't know what they're doing.
Your problem can be fixed by any technician who has the equipment to remove the chip and program a new one with the appropriate data and solder it in without damaging the chip or the mboard, but it's often cheaper to buy a used mboard for your model that has no passwords that were enabled in the bios.