Nice and noob friendly.
I do agree, should add a step for those noobs that went to 4.21CFW. Since you don't need a flasher for that.
How To Go From 4.21cfw to 4.30cfw
insert the 'hey dummy(um, noob) this will only work from 4.21cfw or a another 4.30cfw not OFW' warning here
1. Install 4.25 to 3.55 PUP
[md5=49D80E07FC1F5CA1B0840E02E94635DB] from recovery menu.
2. Install toggle.qa.pkg
[md5=FB11BEC5A0DDE6600BAEE0CC36742D54]and run app from game column on xmb. Make sure to do the button combo to confirm.
3. Install 3.55 CHECKOFF PUP
[md5=8BCF7AB97EE4B9D9F74ECDF9FA9E59A8 (Rogero v3.7 works too[md5=8f8166b25d6bed891f292c77de5c4b28]) from recovery menu or condor updater
4. Install Rogero 4.30CFW
[md5=7EF38C26482465B939A8AB5E960F165C] from recovery or condor updater.
Maybe adding a how to check the md5 hash of your PUP files. To make sure what you are installing has downloaded without errors. Here is a good How To Check MD5 Checksum In Windows 7.
Just my 2 cents. Or I'll make a seperate guide, "How To Go From 4.21cfw to 4.30cfw", and you could just link it. Then while noobs are following it they will just get redirected.
Oh wait, I made it already. Just point them to this post.
This guide is great and straight to the point. Good job as always