DJI will NOT warranty in the U.S. if you purchased elsewhere BUT THEY WILL probably give you the information for one of their enterprise model shops and they may fix it there. DJI wont cover your cost to ship it to korea and that can run you...
it’s worth noting that the max allowable transmit power in the US is 36 dbm (4 watts) so if they follow the pattern of doubling the power every cycle (which is what you need to really have a noticeable difference) they should max out the transmit...
I can confirm, when I first unpacked the drone, activated it and it showed a FW update available right away, so I went ahead and upgraded it to .0200 before even flying it. Like I said earlier, drone would fly, but getting those errors on my RC...