I tried changing usb ports, usb cables, restarting computer and I still get error 1602 in itunes when I try to restore. This iPhone 3gs does not power on, unless connected to an ac adapter. If you disconnect from ac adapter it turns off. When connected to ac adapter, the phone finds itself in recovery mode and the screen says connect to iTunes. How can I fix this phone?
its possible that your battery is completely drained and that everytime it reboots during the restore process it loses all information. since during that reboot time it is not technically connected to power....
according to apple Error 1604
This error is often related to USB timing. Try changing USB ports, using a different dock connector to USB cable, and other available USB troubleshooting steps (troubleshooting USB connections. If you are using a dock, bypass it and connect directly to the white Apple USB dock connector cable. If the issue persists on a known-good computer, the device may need service.
If the issue is not resolved by USB isolation troubleshooting, and another computer is not available, try these steps to resolve the issue:
Connect the device to iTunes, confirm that the device is in Recovery Mode. If it's not in Recovery Mode, put it into Recovery Mode.
Restore and wait for the error.
When prompted, click OK.
Close and reopen iTunes while the device remains connected.
The device should now be recognized in Recovery Mode again.
Try to restore again.
so if youve tried differnt usb ports and chords your next step would be to try another computer?