Quick Guide to update 3.10 to 4.9 Kernel

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.

Make sure you have a backup of your data.
Update process might corrupt your file system even the possibility is quite low.

  1. Gain root access, everything from now on requires root access: 
    sudo -s
  2. Make sure your system is up-to-date: 
    apt update && apt upgrade && apt dist-upgrade
  3. Modifying the repo: 
    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
  4. Update your package information: 
    apt update && apt upgrade && apt dist-upgrade
  5. Update your kernel: 
    apt download linux-image-4.9.30-41
    dpkg -i --force-all linux-image-4.9.30-41_20170531_armhf.deb
  6. 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: 
    apt dist-upgrade
  7. Install the latest Kernel package from our server. http://deb.odroid.in/5422-s/pool/main/l/linux-image-xu3/
    XX-Y is the version number of the kernel package.
    apt install linux-image-xu3=XX-Y

  8. Sync and turn off: 
    sync && poweroff
  9. Turn your board on again and enjoy.