Thanks Illaass !
I followed trouble shooting solution number 1604 and I finally successed to recognize by iTunes my iPod Touch and download the iOS.
For others, the method is the following:
- Connect the device to iTunes, confirm that the device is in Recovery Mode.
- Restore and wait for error 1604.
- When prompted, click OK.
- Close and reopen iTunes while iPhone remains connected.
- iPhone should now be recognized in Recovery Mode again.
- Try to restore again.
The iOS is correctly downloaded on my mac and iTunes ask me to restore my iPod. I launched the restoration and went through all the process (initializing, instalation, verification) but I always got the same message error number 6.
I checked the help page. Therefore I tryed the following solution but no result:
- change USB port (I have no other USB device connected),
- reload iTunes (I have the lastest version),
- disabled iantivirus,
- try to restore the iPod with no internet conection (totally impossible).
What should I do ?
note: during the restoration process, the iPod screen showed a lot of flash and colored lines.