CFW 3,55 Kmeaw No Check for E3 Flasher?

Hi, I have a problem, I want to ReDowngrade my PS3 with my E3 Flasher (With Fast DualBoot) and I want to install the CFW 3,55 Kmeaw, But I can't find a link of this CFW that work with Downgrade Flashers (I guess it's called "CFW No Check"), all of the links are dead (I Tried with Fileserver Mirror, DepositFiles Mirror and MultiUplaod Mirror). Please, Someone can send me a Link working of that CFW No Check, I don't want a Brick or some like that.

And a one thing, I don't want to make a New Thread, but I have a Question. I made a Dump of my NOR in OFW 4,11, But Now I'm in OFW 4,30... If I have a brick in OFW, I can fix it with that Dump, Or I need to make a new dump? (To make a Dump I need to switch my E3 in 001000, but with DualBoot I have the last "0" (lock) in "1" (Unlock), and If I try to 001001, I have the error 11001100 (Wrong switch) I don't Know if I can change the "Unlock/lock" switch in DualBoot

Thanks

You can use Rogero CEX-3.55 CFW V3.7 for downgrading.

Yes, I know that, Right now I have that CFW, But I have problem with some HomeBrews and I want to install the Kmeaw... I tell it to a friend and he tell me "you have DualBoot and for that, you need to Re-downgrade your PS3 and there you install the other CFW".

I have another question... I read how to install the CFW 4,31 V4 of rogero and in a step say "enter to recovery menu and uninstall your actual CFW" but I can't do it that, because if I go to Recovery Menu, the option 6 "update the system" say "please insert a Firmware above of 4,30" and the same friend tell me "you have that message because you are on dualboot", and there's my question: how to install the CFW rogero 4,30 V4 in DualBoot?.

Thanks