Raspberry Pi is actively preventing enthusiasts from upgrading soldered memory to a larger configuration even when the replacement chip is technically compatible. The company says the restriction is intended to discourage unofficial high-capacity resales.
It’s a coreboot distribution (FOSS BIOS/UEFI), so technically it works on more things than advertised.
To install it it does require a little bit of preparation. There’s a lot of commands you have to run using a custom compiler toolchain to build an image for your board. The hardest part is disassembling the laptop, if you have an older one, which is mostly what Libreboot targets.