Samsung

also wiping cache particion may help, and you should keep your files too. If worst comes to worst, let's hope that a full factory reset works if you didn't install any custom firmware or didn't root it ... View more

if you rooted it or at least installed custom firmware you may wanna boot into download mode, back up your files to your computer, factory reset, and reinstall the firmware you downloaded along with thus reinstalling the firmware with whichever Odin version is required. I used to root my old galaxy s5 years back so if any of this applies still, hope it helps m8 ... View more