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Acer Chromebook C720 - ZHN - Linux Install

Series: c720
Model: ZHN
Cost on eBay: US $34.86
With Tax: US $37.95
Screen: 11.6”
CPU: Intel Celeron 1.4GHz

Backup First

Enable Developer Mode

Open a root shell and enable legacy mode

Enable Legacy BIOS mode and USB boot: shell sudo bash crossystem dev_boot_usb=1 dev_boot_legacy=1

Disabling the Write Protect Screw and Setting BIOS Flags

WARNING - This will void your warranty but you probably don’t care with a laptop this old anyway.

This step is optional but really helpful.

Issues that are resolved by doing this:

Need to hold ctrl+l at every boot to boot from HD or USB
Pressing “space” at the start ups screen it could re-enable OS verification which would break the system and require you to re-install the OS.
Letting the battery run down to 0% can disable Legacy Mode which would then require an OS re-install.

To disable write protect and set legacy boot to default so it won’t be lost by power loss open a shell ( Ctrl+Alt+t ) and run the following commands. Pay attention to the output.

sudo bash
flashrom --wp-disable
/usr/share/vboot/bin/set_gbb_flags.sh 0x489