Hi my iPhone is a 3GS and I've tried now to update it for 4.3.5 to 5.0.1 but when its done downloading it comes up with your iPhone is not eligible for this build (i think this is the error message) i need help

plz help me guys

Most often due two one of the following.
1 Install current version of iTunes, older Macintosh Systems will not support current version of iTunes, make sure you have current version of iTunes.
Or
2 Your computer Hosts file is blocking Apple from communicating with iTunes. To determine this, search Hosts on computer, then open Hosts file with a word processor. If the Hosts file contains this, gs.apple.com it is blocking Apple. This line with its number must be inactivated (removing it works). A stock Hosts file does not contain this or block Apple.
Here is Apple information on this problem:
"This device is not eligible for the requested build: Also sometimes displayed as an "error 3194." If you receive this alert, update to the latest version of iTunes. Third-party security software or router security settings can also cause this issue. To resolve this, follow Troubleshooting security software issues.
Downgrading to a previous version of iOS is not supported. If you have installed software to perform unauthorized modifications to your iOS device, that software may have redirected connections to the update server (gs.apple.com) within the Hosts file. First you must uninstall the unauthorized modification software from the computer, then edit out the "gs.apple.com" redirect from the hosts file, and then restart the computer for the host file changes to take affect.  For steps to edit the Hosts file and allow iTunes to communicate with the update server, see iTunes: Troubleshooting iTunes Store on your computer, iPhone, iPad, or iPod—follow steps under the heading Blocked by configuration (Mac OS X / Windows) > Rebuild network information > The hosts file may also be blocking the iTunes Store. If you do not uninstall the unauthorized modification software prior to editing the hosts file, that software may automatically modify the hosts file again on restart. Also, using an older or modified .ipsw file can cause this issue. Try moving the current .ipsw file, or try restoring in a new user to ensure that iTunes downloads a new .ipsw."

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