I'm getting frustated, my Dongle 2.7 pkg didn't work (black screen) please help me

[crissio]

I have fat PS3 old series which had 4 usb slot on it with ps2 backward compability. I have been using Official Firmware (OFW) 3.55 , to play my games from hardisk internal (around 720 gb or something).
I decided to buy true blue dongle. I followed step by step instruction as how to install it, I downloaded PS3UPDAT.PUP (TrueBlue-3.55-CFW-v2) from the official site
truebluejb2 along with true blue update 2.7 pkg.
I put PS3UPDAT.PUP in my flashdisk within PS3/UPDATE folder that I created. I put my flashdisk to my PS3 usb slot , and I went to system update--update via storage media , and it shows 3.55-dongle update, and I updated it. After I finished updating it, I took a quick peek at system information--system software , it still say
(Version 3.55) , its NOT 3.55-dongle or something like that.

And then, I took the next step to install dongle 2.7 pkg because I thought I haven't finished yet so thats why my firmware version still 3.55 (NOT 3.55-dongle-something) , i put my dongle 2.7 pkg in my flashdisk, I put it to my ps3 , I installed it.
The guide says that , I shouldn't place my true blue usb to my ps3 unless I clicked dongle 2.7 pkg and waiting for the instruction to "please insert true blue dongle" to do so. I did that, after I installed 2.7 dongle pkg , I ran it (at this point I still did NOT insert my true blue usb to my ps3), but what happened next was the screen is just complete black , and suddenly my ps3 frozen. So I can't make it shows "please insert true blue usb" or something like that. It just went black screen.

At the point, I am getting nowhere, I did not what I should do, I decided to try a few things:
1. I kept re-installing the 3.55-dongle from update via storage , but everytime it says "you already installed the latest version" or something like that.
2. I uninstall / installing dongle 2.7 pkg again, but the screen still turn black after I ran it
3. I decided to insert my true blue usb to my ps3 when my console turned off, and by doing that I was hoping when I ran dongle 2.7 again, it would work, but no, it still turned black and frozen. The firmware still stay version 3.55 .

So guys, what should I do to fix my problem here? I searched some other similar topic like this, but i think nobody got the exact same issue that I got here.
I would appreciate noob friendly step-by-step answer here, thanks before.

[pete_uk]

Have you tried downloading the Dongle update from a different source?

[MeanMachine]

I think you should try installing the CFW through Recovery Mode first.

[crissio]

@pete_uk , i downloaded it from truebluejb2 the official site, is there any other sources?

@meanmachine , recovery mode? how? I read a bit about recovery mode, but im not quite sure what should I do about it.
I am afraid I messed up my ps3

[MeanMachine]

you wont mess it up, it's a system function...
here's a video:

http://www.youtube.com/watch?v=_2YnGGUOJks

[crissio]

@meanmachine goddamn man, seriously God Bless you. My problem Solved. I just need to do it via recovery menu. bahhhh
Now my system software is : Version 4,11 ; TrueBlue v2.7 , thanks million time man

[MeanMachine]

No problems dude
Some systems won't let you really update your system to the same FW, that's why you need recovery mode.

Glad it helped.