I am trying to restore my jailbroken iPhone 3GS, but every time I get an error 1015 message. How to restore?

I am trying to restore my jailbroken iPhone 3GS having iOS 4.
I am getting an error message 1015 every time.
Unable to restore, please help.

You can try restoring the latest version in iTunes. Be aware that the jailbreak may have altered how your Mac works so you may want to make a clean install of OS X (on a spare disk) & retry installing the newest iOS from Apple onto the device via iTunes.
You can try all the usual steps to restore iOS onto a device.
Use iTunes to restore your iOS device to factory settings
If you can't update or restore your iOS device
You also cannot install older OS's from iTunes so you have little choice but to update the 3GS to iOS 6 (or perform more hacks). If it keeps failing I'd suspect something is altered on the Mac to allow the original jailbreak.
You must search elsewhere if you want to keep the jailbreak.

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