iPhone stuck in recovery mode

[plants]

I read that this was the right place for this type of question. Apologies if it's not.

After trying to update the iOS on my iPhone 3GS I got an error message, and after googling for a fix I ran tinyUmbrella alongside iTunes and tried to update it again. Now I get a slightly different error message ("The iPhone cannot be recovered (1604)") and my iPhone is stuck in recovery mode. Any help would be greatly appreciated as I depend on my phone for a lot of my work.

[Ruzza]

[url]http://www.google.com.au/search?sourceid=chrome&ie=UTF-8&q=The+iPhone+cannot+be+recovered+(1604)[/url]

[macman2212]

hold down the home and sleep button till it turns off and the apple logo shows up