OverviewAfter an upgrade to 7.0.3 you see no bootable partition. The partition shows as unknown.
CauseThis can be caused by an upgrade onto the next partition failing, and then somehow rebooting into that partition. The is booted in an invalid image, hence it shows no bootable partition.
For example: If an upgrade failed due to space issue, and the device rebooted back into the lower version, sometimes a user will then switched to boot into the upgraded partition manually because he can see the image on the partition.
WorkaroundIf you find your Exinda in this state, you should boot back into the valid partition.
Once you back in the valid partition you can try an upgrade.