That was using the exploit Dan Rosenberg demoed, and has been said time and time again not to work for the S4 in unlocking its boot loader.
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The problem is your USB settings in the hidden dialers. Look for tutorials on how to enable them, and once found, type *#0808#, and a list of usb otions will come up. Pick any with MTP and they'll work again.
Yeah, that's fake, Universal makes fake android phones, don't fall for it.
Look... I'm sorry I don't know everything like you... I'm 15
I'm 15 as well, but I also make sure to read up on what I'm doing before I destroy my phone.
The guy who sold you it is an idiot. He attempted to use goomanager to flash a custom recovery. You can stay the way you are and not have a recovery, but if you want it back you should flash a no wipe ME7 Odin image. I did the same thing and is ea...