E3 Flasher limited edition vs E3 Nor Flasher ???

Hi everyone.

I have a fat ps3 model CECHL04 and I need to downgrade it from 4.11 to 3.55 true blue cfw.

I am not interested in dual booting at all and I am wondering if need the Esata station to make the downgrade. Because I heard that the ps3 requires hdd to work. Also, all the tutorials i saw in the forum used the esata station to make the downgrade.

So, would it be possible to do the downgrade without the Esata station using only the E3 Nor Flasher :questionmark:

If the E3 Nor Flasher is good enough, then how to make the downgrade without the Esata station :questionmark:

Please, help me guys on this :dontknow:

Also, the other required devices I need are:
1. True Blue dongle
2. E3 card reader
3. sd card
4. Flash memory

Do I need anything else to make the downgrade :questionmark:

Last question, can I remove the E3 flasher from the ps3 after the downgrade to 3.55 TB CFW :questionmark: