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After removing the internal chip resistor, turn on the power while pressing [▲] and [▼] at the same time.
The reception range (LCD display) after the modification is 110-180 MHz, 300-500 MHz and 800-950 MHz.
It should be noted that "turning on the power while pressing [▲] and [▼] at the same time" is a hard reset operation, and all memory contents are erased.
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