How can I delete my computer BIOS?

acid and thermite

Install Gentoo.

There used to be some Samsung laptops that mounted its bios in r/w in Linux. Firing "rm - rf /" would then wipe the bios.
These Laptops were uefi capable, but not fully compliant. If they made it properly, the issue would not have happened

drill+bios chip

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BIOS is on a ROM chip. If you google what ROM means, your question will be answered.

it didnt't actually mount the bios firmware in r/w, it mounted the place where the config is stored (efivarfs), and some bioses weren't programmed to restore missing files in there, so it just crashes and bricks the laptop.
this is the power of professional engineering.

Who pissed you off and why do you want to ruin their computer?

For at least 2 decades it's been some form of EEPROM or flash memory. All rewritable (or rather, erasable and re-programmable), though there might be a read-only (actually ROM) backup on some boards. Unlikely at the consumer level though.

You can wipe a BIOS only if the firmware download mechanism allows it. Most flashing tools don't even provide the option, requiring a new verified image before erasure precisely to prevent "accidents". If you're trying to brick the system to be a cunt or abuse warranties (which wouldn't work anyway), fuck off.

remove the chip