@miloessence Switch device off. Hold home button and Volume down and press power to go into download mode. In download mode attach device to pc and run Odin. When seen in Odin, find the do not reboot and untick it. Flash the recovery (TWRP) through Odin. When complete, turn the device off. Unplug from PC. Then using the correct key combo, boot into TWRP. Sideload /e/OS from there.
UT is nicer on this device.