en:xu4_upgrade_from_3.10_to_4.9 [ODROID Wiki]

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=== Quick Guide to update 3.10 to 4.9 Kernel ===
<WRAP center round important>
After you perform those steps is very unlikely that you will be able to roll back.\\
It's advised to test 4.9 kernel on a separated microsd/eMMC before upgrading.</WRAP>

<WRAP center round important>Make sure you have a backup of your data. \\
Update process might corrupt your file system even the possibility is quite low.</WRAP>

  - Gain root access, everything from now on requires root access: <code>sudo -s</code>
  - Make sure your system is up-to-date: <code>apt update && apt upgrade && apt dist-upgrade</code>
  - Modifying the repo: <code>if [ -z "$(grep "5422-s" /etc/apt/sources.list.d/odroid.list)" ]; then sed -i s/"5422"/"5422-s"/g /etc/apt/sources.list.d/odroid.list; fi</code>
  - Update your package information: <code>apt update && apt upgrade && apt dist-upgrade</code>
  - Update your kernel: <code>apt download linux-image-4.9.30-41</code><code>dpkg -i --force-all linux-image-4.9.30-41_20170531_armhf.deb</code>
  - Update your system again. New packages that matches kernel 4.9 configuration will be replaced/installed. \\ This includes a new boot.ini that _MUST BE_ installed: <code>apt dist-upgrade</code>
  - Install the latest Kernel package from our server. http://deb.odroid.in/5422-s/pool/main/l/linux-image-xu3/ \\ <color #ed1c24>XX-Y</color> is the version number of the kernel package.<code>apt install linux-image-xu3=XX-Y</code> {{:en:download_ker2.png?nolink|}}
  - Sync and turn off: <code>sync && poweroff</code>
  - Turn your board on again and enjoy.