Can I downgrade iOS 6 to iOS 5 without SHSH blobs?

I've had enough of iOS 6, it's running on my 3Gs and the battery life is horrible,
it is full of bugs, it's slow, and i don't even like the new look.

i didn't think about saving my SHSH blobs, because my iPhone was not jailbroken
when i had iOS 5, so I only have the blobs for 4.3.3

is it possible to downgrade iOS 6, without the 5.1.1 blobs?
or is it possible to downgrade to 4.3.3 and maybe install iOS 5 after that?

thanks in advance!

oh, and my power/lock button is broken, so i couldn't even get into DFU,
if i could downgrade it. Is there a solution?

Check out this youtube video for downgrade tutorial.

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