This triggers an internal system management interrupt on some BIOS versions, bypassing or clearing the password. It doesn’t work on every firmware revision, but it’s free and takes 30 seconds to test.
For most users stuck with a locked HP ProBook 650 G2, is your best bet. It’s free, relatively quick, and works on the majority of these laptops.
The HP ProBook 650 G2 uses a "one-way hash" system. If you enter the wrong password three times, the machine will lock you out for a period. If you guess incorrectly roughly ten times, it will display the "System Disabled" code. At this point, the motherboard is locked until you enter a specific unlock code generated by HP. hp probook 650 g2 bios password reset
While the ProBook 650 G2 does not clear the password simply by removing the battery, performing a "Hard Reset" or SMC (System Management Controller) reset is the first troubleshooting step recommended by HP. It clears the temporary states of the hardware but rarely clears a BIOS password. However, it is non-destructive and worth a try.
When the laptop reboots, you should see a "Checksum Error" or "CMOS Reset" message. Press Enter to load defaults. The password will be gone. This triggers an internal system management interrupt on
If you purchased the laptop second-hand and found it locked, or if you inherited it from a company, this is the most reliable (though potentially costly) method.
The ProBook 650 G2, however, utilizes a security chip (often referred to as an TPM or trusted platform module architecture). The BIOS password is written into the firmware, and the system is designed to resist simple hardware resets. Because these laptops are typically used in corporate environments containing sensitive data, HP prioritized security over easy recovery. It’s free, relatively quick, and works on the
This is a quirky but well-documented trick for older HP business laptops, including the 650 G2.
Resetting the BIOS password on an is more complex than on standard consumer laptops. Unlike older models where removing a CMOS battery might clear security settings, the G2 series stores passwords in non-volatile memory that persists even without power.
If the above steps fail, the only remaining option (other than a motherboard replacement) is physically reprogramming the BIOS chip. This is an advanced procedure that requires specialized tools. BIOS Password probook 650 G2 - HP Support Community
: HP no longer provides SMC files or tools to bypass BIOS passwords via remote support.