You can now install the new Clockworkmod recovery 5.8.2.0 on you Transformer Prime. The update has a lot of changes and improvements like the following:Possibly fixes bricks (by properly restoring boot.img). Correctly comes with Staging/System unmounted. Nandroid Restores properly the boot.img (of backups created with this CWM). This means no more issues when restoring a Rom if you are coming from another from (for example, if you are restoring Virtuous after wiping cm9). Backups are now about 10x faster. Restores are a bit faster (not as dramatic as backups).CWM Recovery lets you flash Custom ROMs and other hacks on android so that you can customize your phone more.
Now that you updated your firmware to the XXKH3 the next thing you should do is to root and install Clockworkmod recovery. Thanks to the Chainfire team they made a file so that we can root and install recovery easily at the same time.