The latest image of Arch Linux ARM seems to have broken drivers for wifi. Replace wget link on line 34 with http://rollback.archlinuxarm.org/os/{year}/{month}/{day}/ArchLinuxARM-chromebook-latest.tar.gz for older working versions of Arch.
Enabling developer mode
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Turn off device.
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Hold ESC and Refresh, then tap the power button.
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Confirm switch to developer mode.
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Press CTRL-D to boot when device restarts.
We cannot boot onto the our USB or SD card until we allow it via root.
Enabling USB/SD booting
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After booting into ChromeOS in developer mode, tap CTRL-ALT-F2 to enter console.
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Login using default user: chronos
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Login to root using command: sudo su
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Enter this command: crossystem dev_boot_usb=1 dev_boot_signed_only=0
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Reboot device.
Installing Arch
Login as root in ChromeOS, then enter the following commands:
cd /tmp
curl -O https://raw.githubusercontent.com/NomCycle/chromeOSArch/master/chromeOSArch.sh
bash chromeOSArch.sh
After it finishes, reboot your device and tap CTRL-U to boot onto your USB or SD card when you are greeted with the bootloader.
Based on this guide: http://archlinuxarm.org/platforms/armv7/samsung/samsung-chromebook