We are deploying the 11.4 update to our devices.

Occasionally we get the odd one fail with the message "An unexpected error occurred during the install process on the device. Check the system-update.log on the device for details."

Now this log is nearly 3000 lines long. What exactly are we looking for?

I can see a few lines that mention errors but how do we go about correcting these?

Sometimes redeploying the update works but some devices will just constantly fail.