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Re:The Big Hack: How China Used a Tiny Chip to Infiltrate Am... by bravo22 on Thursday October 04, 2018 @12:04PM (#18141099)
It does look like a balun which is clever but based on the pinout I think it is meant to intercept SPI flash and patch it as needed.
Re:The Big Hack: How China Used a Tiny Chip to Infiltrate Am... by bravo22 on Friday October 05, 2018 @12:41PM (#18149568)
Looks like I was correct. This image from Bloomberg article seems to indicate SPI flash (https://twitter.com/jamesdotcuff/status/1048221163607007233)