cunsang,
thank you for your inquiry.
language selection for the FAR2137 radar is found in the FACTORY menu. to call up this menu, press (2), (3), and (4) keys in order while holding down the (HL:OFF) key.
CAUTION: be very careful in this menu to only change the language selection to (E) as it possible to accidently erase/wipe ALL settings for the entire radar system.
GP1850D- is the tactile keyboard that is silkscreened on the front of the unit in English? i.e- do you see the letters A,B,C,D, etc. on the #1-9 keyboard? It is possible this unit was not manufactured for the north American market, and as such there is no English language selection available.
With the current software the GP1850D made for north America does allow for a language selection. Menu---Display Options---Language---English
