As of version v0.2.0-b183 updating your firmware will wipe your device.
The update images for the device are hosted on onion.io. You can use oupgrade to automagically update your firmware.
oupgrade --help
Functionality:
Check if new Onion firmware is available and perform upgrade
Usage: /usr/bin/oupgrade
Arguments:
-h, --help Print this usage prompt
-v, --version Just print the current firmware version
-l, --latest Use latest repo version (instead of stable version)
-f, --force Force the upgrade, regardless of versions
-c, --check Only compare versions, do not actually update
-u, --ubus Script outputs only json
You can force upgrade to a specific version with sysupgrade. At this writing v0.2.0-b183 was the latest version.
wget -P /tmp http://repo.onion.io.s3.amazonaws.com/omega2/images/omega2p-v0.2.0-b183.bin
sysupgrade -n /tmp/omega2p-v0.2.0-b183.bin
This will output something like this and eventually your connection will be broken.
killall: watchdog: no process killed
Sending TERM to remaining processes ... uhttpd device-client avahi-daemon onion-helper udhcpc udhcpc packet_write_wait:
Connection to 10.10.10.250 port 22: Broken pipe
Don't turn the device off while it is updating or you could brick it. There is an article on possibly unbricking your device on the community page.
After you update you will need to delete the device from your local ~/.ssh/known_hosts file.
After you flash, you will need to do the WiFi setup again.