I might just have found the solution. I faced the same problem before downloading the first updates it said pending network. The reason for it was that the sim I was using was on roaming.. and when you are on roaming, you can't download your first Updates. ... then I removed the sim and tried a sim with no roaming (local sim) it started downloading. Then I stopped the download and downloaded updates via pc companion (or wifi). After installing the update, you will be able to download the rest of the updates even if you are roaming... problem solved!!
Wishes!!!!
