Special boot modes
Recovery: The bootloader does not allow using hardware buttons to boot to recovery. After apx flash, the device will boot directly to recovery. After installing Lineage, normal methods can be used to reboot to recovery.
Bootloader/Fastboot/Download: For TX2 Devkit - With the device off, press the FRC REC button, then tap POWER. Release FRC REC once apx enumerates. For TX2 NX - With the device unplugged, jump the FRC REC pin, then plug in. Remove the jumper once apx enumerates.