There are two ways of updating your OBi device. See this:
http://www.obitalk.com/forum/index.php?topic=61.msg109#msg109If you don't want the bother of changing provisioning settings etc, then use "Expert Configuration":
Make the changes via the OBi Expert Configuration pages. From your OBi Dashboard, click on your OBi number and follow the prompts to get there. To change a value uncheck both boxes to the right of the value and leave them unchecked. After changing the values on one page, press submit at the bottom of the page and wait a few minutes for the OBi to reboot.