diff --git a/driver/bk4819.c b/driver/bk4819.c
index 06cc0b6..42c72ac 100644
--- a/driver/bk4819.c
+++ b/driver/bk4819.c
@@ -444,9 +444,14 @@ void BK4819_set_TX_deviation(uint16_t deviation)
 //	const uint8_t scrambler = (BK4819_read_reg(0x31) >> 1) & 1u;
 //	if (scrambler)
 //		deviation -= 200;
+
+#if 0
 	if (deviation > 4095)
 		deviation = 4095;
 	BK4819_write_reg(0x40, (3u << 12) | deviation);   // deviaion 0 ~ 4095
+#else
+	(void)deviation;
+#endif
 }
 
 void BK4819_SetFilterBandwidth(const BK4819_filter_bandwidth_t Bandwidth)
diff --git a/firmware.bin b/firmware.bin
index 36e8313..78e29f5 100644
Binary files a/firmware.bin and b/firmware.bin differ
diff --git a/firmware.packed.bin b/firmware.packed.bin
index 54416ac..a733f9f 100644
Binary files a/firmware.packed.bin and b/firmware.packed.bin differ