Upgrade Apple TV to v. 5.3

I have a Jailbroken Apple TV at software version 5.2.  I know there is now a Tethered Jailbreak available for v. 5.3.  I have upgraded aTV to the latest version which supports v. 5.3. 

How can I upgrade my Apple TV Software from version 5.2 to 5.3 WITHOUT losing everything.  I am trying to find out if there is an easy way to upgrade, and then Jailbreak, and restore EVERYTHING back the way it was before I upgraded.  I know I have to connect Apple TV to Macbook and upgrade via iTunes.  But I assume I will then lose the jailbreak and I will be at a clean install of the Apple TV at version 5.3 

My experience with jailbreaking various iOS devices is that after upgraidng the iOS firmware, you have to re-jailbreak and then re-configure everything from scratch, which is maddening.

 

why would you update from an untethered version to a tethered verison? that makes absoulely no sense

Because I want some of the features of the new software, such as HBOGo.