Well I haven't used a Samsung device since then.
Do they still try to prevent you from replacing the rom?
I consider that stuffty behavior from a phone manufacturer.
As with most computers I own, I like to wipe the OS and install whatever suits my actual needs.
In most cases, the rom I choose is as close to stock Android + Gapps as possible.
i remember samsung being the least brown town about rooting out of every manufacturer out there, to the point of even having a dedicated download mode on basically every model that lets you freely install any custom recovery (and by extension, freely root) you could possibly want via odin.
just make sure to boot into recovery instead of android immediately otherwise the stock firmware will overwrite your recovery and you're back to doing this stuff again.
i still have a galaxy tab 3 and that stuff is impossible to root
download desired recovery
power + volume down
plug into computer
run odin 3 and flash desired recovery
boot into recovery with power + volume up
before you boot into android, otherwise the stock firmware will automatically overwrite the custom recovery.
flash root and say yes to prohibiting overwrites to recovery.
gg
doesnt change much between samsung devices except the newer ones you enable OEM unlock in developer options.
if you dont know what a recovery is then you probably shouldn't be blindly rooting.