Does the 25% success rate refer to per boot or per console??
as in does it only boot at 1 in 4 tries
or
Does it only work on 1 in 4 consoles?
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Each try has 1/4 chance to succeed, a try takes around 5 seconds, then the console will try again, and again and .... you got it

That means it takes less than a minute to boot to unsigned code most of the time.