Upgrading and losing network connection on SB1

Hi All,

Just been upgrading my SB1 from 17 to 20.

Whilst in the middle of the upgrade I lost my wireless connection and got a lot of failure messages.

I got an a [-813] and a [-811] what do these errors mean?

I also then left it on the side got a battery to low error and then the device just crashed out, had to use a power and side key to get some response from it.

Now it is the charger and show "Battery Power" when it is sat in the charger and the red LED is flashing.

Should this happen?

Anyone got a booklet of these error codes.