Download Mode in Galaxy Grand Prime Ok so I rooted my phone useing King root downloaded twrp, busy box pro. Anyway I went to reboot in bootloader and i got a downloading screen. How long should this take. Anyway I'm a noob to rooted phones so not positive what I did. I can send a pic of the screen if needed.
That Downloading screen you got is representative of having entered Samsung's special Download Mode for flashing device firmware from a PC over ODIN. Over there, Downloading means downloading from the PC, not from the internet. In case you want to get back to normal Android, keep holding down the Power button until the device reboots. For flashing TWRP, you can try using this app called Flashify. For using it, refer to my other answer here.