To switch the language of your RK, (6370/6470 onward), press and hold the most right button on your roboking. Then it will announce the current language. Repeat to switch between the languages provided. I think 6340/62xx might not have english.
I have also found a link that can be saved as html to use.
LG Map BBL
Basically if you know how (for those who has applied soft patch etc), the flashdrive that you used will retrieve the mappings of the past cleaning duties, (scheduled or manual) then it will display the whereabouts and trail of your roboking.
Anyway, previously I thought my sensors could be malfunctioning but Roboking Diagnosis always report with no defects found.
Apparently flashing the software makes it ok again, but after a few weeks, it will happen again. So no harm trying to reflash it as and when.
As mentioned by one of the bro here, you probably could bring your Korean export sets to LG SG directly for repairs at a cost of labour and parts.
LG Roboking seems to be quite outstanding, at least for my expectation of being a clean freak guy. Helps a lot when i leave my place over weekends, comes home to a clean floor, except for the few hiccups of not returning to base randomly.
Hope it helps.