Yes, we found that 4.01 has an issue for some people using Sirius weather (BBWX3) due to changes made in the Sirius downstream of data. We should be seeing a new version soon so Japan has chosen not to place the software on NavNet.com or the Wi-Fi upgrade site. If you would like 4.01 software, it is posted on the Furuno USA web site under the product with the instructions.