00:00On an HP EliteBook 820G1, simply removing the CMOS battery or main battery will not clear forgotten BIOS setup password
00:08as modern HP business laptops store security settings in a non-volatile EEPROM slash chip rather than a volatile clock
00:17RAM.
00:18To clear or reset the BIOS password on this model, you have three primary approaches depending on your technical skill
00:24and tools.
00:26Method 1, the system disabled code trick. If a recovery prompt is active, if your BIOS allows you to enter
00:33a password prompt and trigger a system disabled state, power on the laptop and repeatedly tap F10 to enter the
00:39BIOS.
00:41Intentionally type an incorrect password three to five times until the screen locks and shows a system disabled code, often
00:48displaying an I or a hash stream. Note down the exact code displayed on the screen.
00:53Contact HP customer support or an authorized HP service provider. To request an official SMC BIOS, reset SMC.bin file
01:03or unlock sequence corresponding to your system's serial number.
01:07Method 2, EEPROM slash chip reflashing, advanced slash DIY. If the system does not give a reactive unlock code, the
01:15BIOS password is saved inside the physical flash chips on the motherboard.
01:19Disassemble the laptop, power down, unplug the AC adapter, remove the bottom service door, and disconnect the main battery and
01:28RTC, CMOS coin cell battery.
01:31Locate the BIOS chips. Identify the main SPI flash memory chips on a motherboard, typically wind bond chips holding 16
01:39MBIs and or smaller companion blocks.
01:42Use an SPI programmer. Connect an external CH341A or similar SPI flash programmer with a CMOS slash slash 8 clip
01:53directly to the BIOS chip pins without necessarily de-soldering it.
01:58Hook the programmer to a secondary computer via USB. Read and save a backup of the existing corrupted slash locked
02:06binary dump first.
02:07Clear or write a clean, unpassworded, patched BIOS.bin file specific to the HP EliteBook 820-G1 model.
02:16We assemble and boot, disconnect the programmer, reconnect the batteries, and power on the laptop to boot into a clean
02:24state.
02:25Method 3, official HP service center. Authorized route.
02:29Because the EliteBook 820-G1 utilizes enterprise-grade security features.
02:35Enterprise models often require the system board's security descriptor to be cleared via proprietary HP maintenance tools.
02:42You can open a case through the HP support portal or take the unit to a certified service center.
02:47If the laptop is out of warranty, this service will usually incur a labor part fee.
02:52And that's the full picture.
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