ls -1 G*0060.MP4 | sed -r "s/(.*)/file '\1'/g" > list.txt
ffmpeg -f concat -i list.txt -c copy GOPR0060.joined.MP4
service bootcomplete_handler /system/bin/sh /system/bin/bc_handler.sh
fastboot oem device-info
For me only SystemUpdateService$SecretCodeReceiver had to be disabled. All other activities, receivers and services with a name starting with "SystemUpdate" were already disabled. I used ADB + "pm disable" to disable this one component.
Here is a list of commands to disable all SystemUpdate "stuff" via ADB (of course it requires a rooted phone with some sort of "su" installed):