Yeah, kammmmi, that's true, but a E3 Flasher is expensive.
If you really are that desperate to get a jailbreak buy it, but in my opinion its not worth it at all.
you probably seen that on Facebook , those "TLK:carling:" & Joey:carling:.
You cant Downgrade your 4.20/4.21 to 3.55 Pretty much without a E3 Flasher or Any Kind of flasher .
You will just brick your Console .