I'm attempting to flash and boot into TWRP to install LineageOS, but try as I might the process described on the LOS website simply doesn't work. My first step is to attempt to flash TWRP via Heimdall. I boot into Download Mode, and run the following command:
heimdall flash --RECOVERY twrp-3.2.3-0-gts28vewifi.img --no-reboot
It's not really clear whether this works. Heimdall claims it was 100% successful, but a progress bar shows up with what looks like 1% remaining, that never completes. If I shut down here and attempt to reboot into recovery mode by holding Power + Volume Up + Home, the device just hangs at the splash screen that says Samsung Galaxy. I've tried literally dozens of different guides and nothing works.