Q: iPhone 4S how do you reset this phone in recovery mode

Not quite clear what your problem is, your phone being stuck in recovery mode or not being able to restore in iTunes.

Check these articles:

If you can't update or restore your iOS device

Use iTunes to restore your iOS device to factory settings

Has the software of the phone been modified in the past?

Unauthorized modification of iOS can cause security vulnerabilities, instability, shortened battery life, and other issues

Good news, enjoy your device again

can u help me ingo2711 i have a 4s never jailbroke never modified worked fine, then went to upgrade to ios 8 and it now is in restore mode but says error 29 everytime i try to restore it

@cjzielie

Try these suggestions, if they don't work, open your own new thread, because the OP had a different problem.

Check for hardware issues

Related errors: 1, 3, 10, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 1000, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.

These errors mean that your device or computer may have a hardware issue that's preventing the update or restore from completing.

1. Check that your security software and settings aren't preventing your device from communicating with the Apple update server.
2. Then try to restore your iOS device two more times while connected with a cable, computer, and network you know are good.
3. Confirm that your security software and settings are allowing communication between your device and update servers.
4. If you still see the error message when you update or restore, contact Apple support.

copied from iTunes: Specific update-and-restore error messages and advanced troubleshooting