There's a big problem on Raspberry Pi users on South Korea. Broken wifi channel setting applied to Wifi Country = KR while using internal wifi chipset. According to iw reg get pi@LimePi:~ $ iw reg get global country KR: DFS-JP (2402 - 2482 @ 40), (N/A, 13), (N/A) (5170 - 5250 @ 80), (N/A, 20), (N/A)...