I called it "The Echo."

I killed the main FTP process. I wiped the public directory. But the backdoor was already in the wild. The K2001N units had auto-update enabled. They were peer-to-peer seeding the corrupted to each other via Bluetooth, without any internet connection.

I downloaded a fresh copy to my bench unit. K2001n, firmware 8.1, rooted. I watched the screen flicker. The maps app opened by itself. It wasn't showing roads. It was showing probability vectors —red lines predicting where cars would be in five seconds.