Why? Because the HP ProBook 650 G5 uses an with non-volatile memory. The password is not stored in volatile RAM; it is burned into the chip itself.
Websites like bios-pw.org or dogber1’s generator work for older HP models (ProBook 4x0s, EliteBook 2×60 G3). For the (with a 6-digit code displayed after 3 wrong passwords), none of the free generators work. Any site claiming “exclusive 650 G5 master” for free is fraudulent .
Reports indicate HP may no longer provide these files for older out-of-warranty units and instead recommends a motherboard replacement. HP Support Community The "System Disabled" Code Method