Iphone 3gs wont restore tells me unknown error (-1) What needs to be done to fix this?

sory i can not

Hi, your i phone has problem in its Eprom either operating system is corrupted or the Eprom chip is damaged needs replacement. take it to a technician for flashing( soft ware re-installation )

go to apple store or do it on itunes

Error 21 is most commonly encountered if you backed up the phone with jailbroken software and then try to restore the jailbroken software. If that's what you're trying to do, I would advise against it. Try to restore from a non-jailbroken image instead.
If that's not what you're doing, there's some other reason that your restoring image has been corrupted, and I'd recommend restoring from another computer, but that would sadly mean starting over from scratch with all your saved data.

Step 1: Find out which generation your iPhone is by looking at this link http://support.apple.com/kb/HT3939
Step 2: Download the correct generation with the most up-to-date number, the higher the number, the more up-to-date it is. Example: A 3GS iPhone, that would be the most up-to-date would be iPhone 3GS (4.2.1/8C148a). The 3GS tells it that it is the iPhone 3GS. The part I have put in bold, is the update number, the higher that number is, the more recent it is.
Step 3: Go into iTunes, with your iPhone plugged in, go to the left side of the screen, scroll down and select your iPod.
Step 4: The right side of your screen should now show the general iPhone information. Scroll down the screen on the right side until you see a button that says "Restore". Hold down the SHIFT KEY on your keyboard and click "Restore" on your screen. This will pop up a menu.
Step 5: From that menu, choose the update you just downloaded and hit OK. Your iPhone will now be restored. After a few minutes, you will be greeted with a welcome screen to re-sync your iPhone.
This is the only method that seems to work.

your iphone needs to be synced with itunes or activated with your service provider.

1. open itunes on your computer
2. plug your iphone in to a usb port on your computer
3. follow the instructions on the screen

If you havent done any of those things, take it in a nd have it repaired. That should be covered under warranty.

If they tell you they wont fix it, check out the followin glink for a low cost Iphone screen repair service

Repair Iphone 3GS Backlight Problem

You need a new logic board. Apple should give you a replacement. If you're out warranty, you can try to open it and replace the logic board yourself. You can get the part at iPad Repair and there is a guide that shows you how to open a kindle and install parts at iPad Repair Guide.

There is a service that offeres repairs for the iPhone 2G, 3G and 3GSand provides a one year warranty on all new replacement parts. iPhone Repair NYC

When your restore fails, it usually tells you, Your iphone could not be restored, an unknown error occured(number). Get that number and either post it on here or call 800 my iphone with it.