Getting root on a Winkhub through UART

Excuse the narrative, I was bored. This video follows the guide written by Matt Carrier found here: https://mattcarrier.com/post/hacking-... Rather than holding things in place with Legos, I just solder some male headers to the UART through holes. The USB TTL adapter I used: http://us.banggood.com/Wholesale-Ware... I copy the wrong line of text around 4:02 so it loads the wrong kernel but the results are the same, a root shell. If you're following this you'll definitely want to copy the app_boot line, not the app_boot_bad line. =)