Translating step 5
Open TinyUmbrella and start the TSS server. After that, open iTunes. If iTunes detects your iPod is in Recovery Mode, you are in DFU mode.
If you are on a Windows system, press Shift. If you are on a Mac, hold down Opt. After doing that, click Restore iPod...
If you did this right, you will get a file chooser. Select the IPSW you want to downgrade to. THIS IS THE POINT OF NO RETURN. If you want to do it, click Open.