IPhone 3g stuck in recovery mode?

I was updating my brothers iphone and its now stuck in recovery mode, how do i get it out?

If you have done a back-up before updating you can restore it to the previous version.
To do that
Option 1:
press and hold down the Home button on the front of the iPhone for at least 6 seconds. In most cases this should shut down the unresponsive application and return you to the main menu.

Option 2:
if option 1 didn't work then you will need to reset the iPhone. You can do this by pressing the Home button and the Sleep/Wake button on the top the iPhone's case and holding them down together for 10 seconds. The iPhone should then reset itself and return to the locked state

If neither of these two options fixes your unresponsive iPhone then you should connect it to your Mac or PC and launch iTunes. Click on the Summary tab and then click on the Restore button.

REMEMBER: This will restore your iPhone to its factory settings and install the latest version of the iPhone operating software. It will also erase all the songs, videos, calendar and contact information on the iPhone. (Though it is easy enough to reinstall that info by syncing with iTunes when the iPhone is fixed).