If you want to flash the BIOS and replace the (end of life) ChromeOS, follow the instructions at MrChromebox.tech:

1) Enter Recovery Mode by holding the Recovery Button while pressing the power button

2) Put the device into Developer Mode by pressing Control-D to turn OS Verification off, then reboot and wait for the machine to boot into Developer Mode

3) Get a Root shell by pressing Control-Alt-F2 (right arrow) and logging in as chronos/chronos

4) Download the firmware utility by typing "curl -LO mrchromebox.tech/firmware-util.sh > firmware-util.sh"

5) Run the firmware utility by typing "sudo bash firmware-util.sh"

6) "Install/Update UEFI (Full ROM) Firmware" by selecting option "2" (assuming you removed the write protect screw)

7) Reboot and install an operating system like Debian 12 (note that the install requires using the full capacity of the tiny SSD - do not select the option of a separate /home partition)