It is possible to flash the altfw/edk2 legacy firmware to the asus chromebook c523na?

i want to flash the edk2 legacy firmware to my asus c523na. Is that possible?

What OS do you want to install?

i want to install manjaro with chromeos

Yes, it’s possible. You can read about how to flash edk2 altfw using the firmware utility script here.

You should also read the docs for more details about installing an alternate OS to ChromeOS. The docs don’t cover dual booting in much detail so if you have any questions feel free to ask.