Dial tone means nothing more than your phone is connected to a powered up OBi. You get dial tone from an unconfigured OBi straight out of the box. Even without being connected to your network.
Your opening post said "updated firmware". What prompted you to write that? The latest firmware versions are 5898 and 5921. One of those is usually pushed to the OBi soon after doing the **5 business to register on the portal. If the OBi is within the initial 1 year support period try dialling ***6 to check for automatic update. If one is not offered you can manually load firmware 5921.
1. Download it from
http://fw.obihai.com/OBi202-3-2-2-5921EX-332148940.fw to your computer.
2. Dial ***1 and write down the IP address of your OBi which will be read out to you.
3. Enable access to the OBi's onboard interface from the INTERNET port. Dial ***0. Then dial 30#. The value 0 will be read out to you. Follow the spoken prompts to change that to a 1.
4. Point a browser at the IP address you wrote down. Login with admin and admin.
5. Click on the + to the immediate left of 'System Management'. Click on 'Device Update'.
6. Click on the "Choose file" box and navigate to where you saved the download.
7. Click on the "Update" box.