The hack is to inject add-ons pack with a custom kernel, Busybox, Nano 2.09, powertop, dropbear, wireless tethering option, titanium backup and more.
Before you begin: Make sure you that you make a backup first using Nandroid. No one can be held responsible if you land-up in trouble, of course you can seek help from us at twitter @taranfx.
Step 1: Flash using the addon over the existing firmware. Don’t wipe!
Step 2: Next, install Wireless tethering, VPNC client, Adfree, N1 Torch, etc as per your will. For enabling wired tethering, you’ll need to download an app for that from either Android Market, or directly from here.