How to recover password for IBM T43 laptop?

Question

Windows

Hello,
they brought me a laptop that, when turned on, shows such a window

. The owner says that it was like this, he was sitting in the laptop, then the battery ran out and when turned on, this window appeared and he also does not remember the password.
I started to look too, googled, pulled out the battery completely de-energized anyway, the window is also the same, I tried to go into the BIOS, the BIOS is also not included.
It was transported for about 2-3 days. Maybe someone knows how to restore?

Answer 1

Did you watch the video on YouTube? Link

Answer 2

A password on IBM laptops
suddenly helps - How to Reset an IBM ThinkPad BIOS Password