techteendaily
been there, done tech

On Raspbian, using a HDMI to DVI-D cable tvservice cannot detect any possible EDID combination and defaulted to 640x480 with unnecessary overscan. Upon running

tvservice -d edid

you get "nothing written".

So you'll have to refer to the table here and use the correct EDID combination and stick it into the /boot/config.txt file.

Next open up the /boot/config.txt by typing

sudo nano /boot/config.txt

and uncomment (removing the #) hdmi_group and hdmi_mode and set them to the correct values. For computer monitors which uses DMT, the hdmi_group=2, while for TVs, which uses CEA use hdmi_group=1. For example, for our purposes we use the following combination DMT output with 1920x1080 60Hz resolution.

hdmi_group=2

hdmi_mode=0x52

Then disable overscan by uncommenting disable_overscan=1. After that press CTRL+O and press enter and then CTRL+X to exit the editor, and finally type the following to put the resolution in effect.

sudo reboot

Prerequisite (Important)

• Make sure your Windows user account name has no space in them. (e.g. "John Stewart" will cause redsn0w to fail to parse the directory string and giving the "unexpected parameter error") If you are using such account, create a new account with no space in them and work in it.
• iTunes must be installed in order for the software to detect the iPod in DFU mode.
• Version of Windows does not matter (32/64-bit, Windows 7 or Windows 8 or Vista or whatever)

 Steps

1. Download Gecko iphone toolkit.
2. Run it, and select your idevice's name and click boot.
3. Note down the required ipsw file name in the pop up and close the browse window.
4. Go to http://ipswdownloader.com/download-ipod-ipsw-files.php and download the corresponding ipsw file.
5. Turn your ipod off, and plug it in to your computer.
6. Go back to Gecko iphone toolkit and click boot, and select the downloaded ipsw file.
7. Follow the instructions displayed.
8. You're basically done.

I have done the above steps and successfully recovered the passcode for an iPod touch 4th gen on a Windows 8.1 computer. If your device is not listed in the Gecko iPhone toolkit list, please consult Google.



iPod touch 4th gen on the key recovery stage