- With which model it is easier to install coreboot on it?
No practical difference, the building and flashing procedure is the same.
Not quite so. On T520 the flash chip is accessible right after you remove the keyboard and the palmrest and there's no need to remove the motherboard from chassis. On T530 there are two flash chips and while the 8M one is easily accessible after you remove the palmrest, the 4M one is covered with the magnesium frame and you have to disassemble the laptop completely, and the 4M one is the one you need to flash. Although it's possible to use just the 8M chip by using modified layout, it might be confusing for a beginner. (I wrote a guide how to do that based on my W530 experience, here: https://www.reddit.com/r/coreboot/comments/956ymu/howto_flash_coreboot_on_x2...)
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Evgeny Zinoviev