I had the same problem. I had messed around with uEnb.txt and made it unreadable to the OS, stopping the OS from loading. I tried the link to that version of Linux you listed, but it didn't work at all. Then, I tried a different version,(https://debian.beagleboard.org/images/bone-debian-9.9-lxqt-armhf-2019-08-03-4gb.img.xz) and it booted up like it should have when I held down S2. Also, on the matter of using a USB to UART cable, the manufacturer of the cable had the labels reversed. (Tx and Rx). Be aware that this might be a problem for you too. That took a while to trouble-shoot because the gobbledygook that is output to the screen is usually thought of as being just a bad baud setting.
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