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He says you can't trust any 4s. He is a 4. That means he's lying but can't be lying or his lie would be a lie.
Unless his lie isn't that all 4s can be trusted, that's a paradox, it's that ANY 4 can't be trusted. Essentially, SOME 4s lie, including him by saying ALL 4s lie.
Basically "All 4s are liars" can be a lie if even one of them tells the truth, including the one that says the last digit is NOT upside down.
Well the case is that assumption all 4s are liars is essential to figuring this puzzle out. In this puzzle, and in another with the same mechanics all of the 4s was liars except for this one, not some of them liars and some of them not.
The assumption all 4s are lying is why you couldn't figure this puzzle out.
If all of them lie, he's telling the truth. Paradox.
If none of them lie, he is lying. Paradox.
If some of them lie, he is lying and you should count anything a 4 says as a maybe. Essential clues are given by other 4s
He is not the only 4 who lies, nor are 4s the only liars.