Though you may need to resign some for 3.55 keys but most likely this won't be the case. From here you can use multiMAN and other homebrews. Once this is done reboot the system then enable HEN.
I like the Rebug one as I use the Rebug pt3 theme by so it matches up.
Once this is done there is a new set of tools under network called Hybrid Firmware Tools. Granted it works 90% of the time so it's up to you. There is nothing wrong with the offline HDD/USB one but you can't be sure it's enabled everytime. I prefer the USB as you can use the HEN enable HTML files of to ensure it's enabled each time. Then simply put the PKG file on the root of a USB drive. Now from here go to ** >Domain no Longer owned by team** ( =new) and under the HEN tab choose enable HAN & dev_blind. What 3000 models can't do is install CFW but you seem to know the is. It installs on every system I think your misreading as this firmware is for every model PS3. There is more risk of a brick then installing a normal Sony firmware. You may have to do this from recovery menu if you are already on 4.84 OFW.
