A. Check if the antenna is dual-mode.
Solution: If not, replace it with a dual-mode one.
B. Check if GPS positioning is properly set.
Solution: If not, reset it.
C. The radio is placed in a blocked environment.
Solution: Place the radio in an open area.
A. Improper connection.
Solution: Check cable connection.
B. Check if USB driver is not installed on the PC.
Solution: If not, install the driver.
C. Check if the interface board of the earphone is in poor contact.
Solution: If not, replace the board.
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