Ipod Touch 4g doesn´t work after firmware update

Hello togehther,
i had two times the same problem with my iPod. Apple sent me two times a new iPod, but i don´t want to have new iPods every two weeks, i want to have an ipod that works a long time.
The problem:
-I tried to install Apps, but it didn´t work, iTunes says the apps are "invalid".
-When I update the firmware, at the end, there is the error message "-1" an the iPod hasn´t any firmware anymore. You couldn´t reset the ipod, because the error "-1" comes everytime and you can´t start the ipod anymore, because it has no firmware.
Maybe the problem is because of the apps? Maybe a problem with my iTunes? Or what could it be?
Thanks for help!

The best place to look for help first is Genuine Apple help directly from Apple.
Read the iPod Touch Users Guide.
http://support.apple.com/manuals/#ipodtouch
Also start with the basics from Apple.
1. *Restart iPod touch:* Press and hold the On/Off Sleep/Wake button until the red slider appears. Slide your finger across the slider to turn off iPod touch. To turn iPod touch back on, press and hold the On/Off Sleep/Wake button until the Apple logo appears.
If you can’t turn off iPod touch or if the problem continues, you may need to reset iPod touch. A reset should be done only if turning iPod touch off and on doesn’t resolve the problem.
2. *Reset iPod touch:* Press and hold both the On/Off Sleep/Wake button and the Home button for at least ten seconds, until the Apple logo appears.
For more troubleshooting suggestions, see Appendix B, “Support and Other Information,” on page 214.
And More..........

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