1440×900 @ 60 HZ C2 Boot.ini file

Download .xz image, extract using winrar. Flash .img to sd/emmc using etcher.

Winrar: https://www.rarlab.com/rar/wrar560.exe
Etcher: https://etcher.io/

XU4 Mate: https://odroid.in/ubuntu_18.04lts/ubuntu-18.04-4.14-mate-odroid-xu4-20180501.img.xz
XU4 Minimal: https://odroid.in/ubuntu_18.04lts/ubuntu-18.04-4.14-minimal-odroid-xu4-20180531.img.xz
XU4 Android: https://dn.odroid.com/5422/ODROID-XU4/Android/4.4.4_Alpha_6.5_Aug-08-2018/android-4.4.4-alpha-6.5-emmc_installer-odroidxu4-20180808.img.zip

Set switch to EMMC/SD, plug in power, fan should spin for a few seconds and then start booting. if it’s the first time booting, unplug HDMI and power cable, wait 2 seconds, and then reconnect. You MUST unplug the HDMI or it won’t work.

C2 Mate: https://odroid.in/ubuntu_18.04lts/ubuntu-18.04-3.16-mate-odroid-c2-20180620.img.xz
C2 Minimal: https://odroid.in/ubuntu_18.04lts/ubuntu-18.04-3.16-minimal-odroid-c2-20180626.img.xz
C2 Android: https://www.odroid.in/mirror/dn.odroid.com/S905/Android/ODROID-C2/selfinstall-odroidc2-eng-s905_6.0.1_master-100-v4.3.img.xz