questions about jailbreaking for kindle 3 3g+wifi

hi, i recently dug out a kindle 3 3g+wifi from my old study (turns out i already have an ebook reader! :2thumbsup), and my friend suggested that i do a jailbreak.

the truth is that i'm not really sure about what the jailbreak is or what i'm supposed to expect, and my friend's kindle is a lot newer than mine :help:

here's what i've already did:
1) i found this thread https://www.mobileread.com/forums/sh...ad.php?t=88004 and copy-pasted update_jailbreak_0.5.1_k3g_install.bin into my kindle (which was working with a 3.2.1 system) and updated it
2) it restarted and i didn't get any notice of whether it's free so i decided to update it with amazon's .bin files to 3.4.2
3) after updating, i did no.1 again and got the same result

so my question is
1. how am i supposed to know whether my device is free?
2. why doesn't my screensaver change after i updated it with Update_ss_0.47.N_k3g_install.bin?
3. after i've broken free, is it possible to change the homescreen book list into grids showing the book covers?
4. can i install KUAL: Kindle Unified Application Launcher in my device? or is the version of my device too old?
:thanks::thanks: