wiki.mbirth.de/know-how/software/openwrt/_posts/2014-05-26-sysupgrade-with-extroot.md

created	layout	layout_old	redirect_to	tags	title	toc	updated
2014-05-26 22:30:20 +0200	redirect	default	https://blog.mbirth.de/archives/2014/05/26/openwrt-sysupgrade-with-extroot.html	know-how software openwrt	OpenWRT sysupgrade with ExtRoot	false	2014-05-26 22:47:49 +0200

Run sysupgrade or upload the new file with LuCI.

When upgrading with ExtRoot mounted, your configuration in ExtRoot will be saved and **restored to the `overlay` in Flash memory**. So if you have a specific emergency configuration, be sure to boot without ExtRoot before starting the upgrade.

After the reboot, you will be in the base system (that is, your configuration, but without ExtRoot). Run these commands to get back on track:

opkg update
opkg install block-mount
opkg install kmod-fs-ext4
opkg install kmod-usb-storage
mount /dev/sda1 /mnt
rm /mnt/etc/.extroot-uuid
reboot

After this reboot, either everything will be working again (/dev/sda1 mounted to /overlay) or - if there was a new kernel in that upgrade - /dev/sda1 might be mounted to /overlay-disabled. In that case, you have to recreate ExtRoot (save your configuration first).

If your previous ExtRoot mounted fine, you might want to update your packages there. It is important to NOT upgrade kernel modules as this might break things. The ExtRoot Wiki Page lists a command to only update non-kernel-packages:

opkg upgrade $(opkg list-upgradable | awk '($1 !~ "^kmod|Multiple") {print $1}')