How can i authorize my PC to my phone that doesn't work properly?

So yesterday I accidentally changed my phone's *(Samsung Galaxy Note 4 SM-N910C)* dpi from 640 to 140 using Nomone Resolution changer that uses root and that **screwed** up my whole phone because now it completely skips my lock screen background and straight to my home background but all it shows me is the background itself and a *tiny* error that says "System UI has stopped" and its literally the only thing there. I tried resetting my dpi using adb commands but the problem is that my laptop isn't authorized to my phone, I mean usb debugging is on (i think) but I don't think that will help because I have no access whatsoever inside of my phone and I don't have CWM recovery flashed so I have no clue what to do :'(( I saw this post that says i should try installing a custom launcher to fix the problem but like I said its no use trying to do anything because my laptop isn't authorized:( I seriously have no clue what to do and I really don't want to reset my phone because I have a lot of important files and pictures there, any suggestions? Thanks. ***Update***: So i managed to flash TWRP recovery but now i don't know what to do because I don't have a back up and i dont know the file that managed to change my dpi but at least i managed to progress somehow. What do i do next?