The error code 801811A5 means that you cannot connect to the internet. There are a few things to do to check why this error occurs while trying to update your mobile phone. These have been listed below.
- See if you can browse the internet. If you cannot browse the internet then you need to check your cables if you are using a network. Also check if you are connected to the WiFi if you are using a wireless connection in the office or at home. Restart your wireless router to ensure a connection and wait 20 seconds to try again. Check if you still have a valid internet account if you are using GPRS. Check your GPRS settings on your phone.
- If you can browse website but not run any updates then certain parts of the Zune software might not be loaded. Restart your phone and try again and this will load the software again.