RecBoot 1.0 : Fix errors 1015, 16xx While Downgrade ios 4 ( Full Guide )

This utility will allow you to resolve, may be some errors 1015, 16xx encountered when restoring a firmware downgrade the firmware to the iOS 4 3.1.3 or 3.1.2, exit the loop mode when you 're stuck on the apple.
There are other software like easyRecovry test too or with our Post Here

This concerns particularly those with 3G iPhones and iPod Touch 3G.

iPhone 3G, iPod Touch 2G (not MC) use Ireb + iTunes restore old firmware.

Required:

ITunes 9.1.1 or older version of iTunes.
firmware.
Net.Framework 4.0
RecBoot (Windows) - RecBoot (Mac)

Windows Vista and Seven.

Right click on RecBoot.exe
Develop fitness for XP SP3 in the property and run as administrator.

iPhone 3G and iPod Touch 3G

Windows: go to the menu and then Start the Run.
Go to C: \ Windows \ System32 \ drivers \ etc \ hosts
For Mac: / etc / hosts
You must modify the hosts file with notepad.
On the last line, add: or 74.208.105.171 gs.apple.com 74.208.10.249 gs.apple.com

Save and close the file.

Connect your iDevice iTunes.
Switching to DFU mode
Restore an old firmware.
SHIFT + RESTORE (ALT + RESTORE Mac user) and give him the firmware.
Wait error 1015 or other ...
Launch RecBoot.exe

The goal is to force the installation of the firmware you are trying to restore, testing or if you have a 16xx error when restoring a custom firmware.
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