It seems like root is the factory-installed option by LG for D838 because one user called "namco" from mobile01
has proofed that he also got the red "ROOTED" in the Download mode without first trying to run root.bat. Could this be the reason "adb reboot recovery" doesn't work (coz LG is root and blocked the system partition)?
What about the situation on F350K/L/S phone? Can someone who owns F350K/L/S try to enter into Download mode without first running root.bat to see if it's also got rooted initially by LG?