diff --git a/libarmbox/audio.cpp b/libarmbox/audio.cpp
index b9f8cb8..196a03c 100644
--- a/libarmbox/audio.cpp
+++ b/libarmbox/audio.cpp
@@ -92,7 +92,15 @@ int map_volume(const int volume)
 	if (vol > 100)
 		vol = 100;
 
+	// convert to -1dB steps
 	vol = 63 - vol * 63 / 100;
+	// now range is 63..0, where 0 is loudest
+
+#if BOXMODEL_VUPLUS4K
+	if (vol == 63)
+		vol = 255;
+#endif
+
 	return vol;
 }
 
@@ -103,10 +111,8 @@ int cAudio::setVolume(unsigned int left, unsigned int right)
 	volume = (left + right) / 2;
 	int v = map_volume(volume);
 
-	// convert to -1dB steps
 	left = map_volume(volume);
 	right = map_volume(volume);
-	//now range is 63..0, where 0 is loudest
 
 	audio_mixer_t mixer;
 
diff --git a/libarmbox/hdmi_cec.cpp b/libarmbox/hdmi_cec.cpp
index 8ebe131..fafc8a0 100644
--- a/libarmbox/hdmi_cec.cpp
+++ b/libarmbox/hdmi_cec.cpp
@@ -60,6 +60,7 @@
 })
 
 #define CEC_DEVICE "/dev/cec0"
+#define CEC_HDMIDEVICE "/dev/hdmi_cec"
 #define RC_DEVICE  "/dev/input/event1"
 
 hdmi_cec * hdmi_cec::hdmi_cec_instance = NULL;
@@ -72,6 +73,7 @@ hdmi_cec::hdmi_cec()
 	standby_cec_activ = autoview_cec_activ = standby = muted = false;
 	hdmiFd = -1;
 	volume = 0;
+	hdmi_mode = false;
 }
 
 hdmi_cec::~hdmi_cec()
@@ -193,15 +195,39 @@ bool hdmi_cec::SetCECMode(VIDEO_HDMI_CEC_MODE _deviceType)
 		return true;
 
 	}
+
+	if (hdmiFd == -1)
+	{
+		hdmiFd = open(CEC_HDMIDEVICE, O_RDWR | O_NONBLOCK | O_CLOEXEC);
+		if (hdmiFd >= 0)
+		{
+			hdmi_mode = true;
+
+			::ioctl(hdmiFd, 0);
+
+			GetCECAddressInfo();
+
+			if(autoview_cec_activ)
+				SetCECState(false);
+
+			Start();
+			return true;
+		}
+	}
+
 	return false;
 }
 
 void hdmi_cec::GetCECAddressInfo()
 {
-	if (hdmiFd >= 0)
-	{
-		struct addressinfo addressinfo;
+	struct addressinfo addressinfo;
 
+	if (hdmi_mode)
+	{
+		::ioctl(hdmiFd, 1, &addressinfo);
+	}
+	else
+	{
 		__u16 phys_addr;
 		struct cec_log_addrs laddrs = {};
 
@@ -234,15 +260,15 @@ void hdmi_cec::GetCECAddressInfo()
 			addressinfo.type = CEC_LOG_ADDR_UNREGISTERED;
 			break;
 		}
+	}
 
-		deviceType = addressinfo.type;
-		logicalAddress = addressinfo.logical;
-		if (memcmp(physicalAddress, addressinfo.physical, sizeof(physicalAddress)))
-		{
-			hal_info("[CEC] %s: detected physical address change: %02X%02X --> %02X%02X\n", __func__, physicalAddress[0], physicalAddress[1], addressinfo.physical[0], addressinfo.physical[1]);
-			memcpy(physicalAddress, addressinfo.physical, sizeof(physicalAddress));
-			ReportPhysicalAddress();
-		}
+	deviceType = addressinfo.type;
+	logicalAddress = addressinfo.logical;
+	if (memcmp(physicalAddress, addressinfo.physical, sizeof(physicalAddress)))
+	{
+		hal_info("[CEC] %s: detected physical address change: %02X%02X --> %02X%02X\n", __func__, physicalAddress[0], physicalAddress[1], addressinfo.physical[0], addressinfo.physical[1]);
+		memcpy(physicalAddress, addressinfo.physical, sizeof(physicalAddress));
+		ReportPhysicalAddress();
 	}
 }
 
@@ -269,11 +295,18 @@ void hdmi_cec::SendCECMessage(struct cec_message &txmessage)
 			sprintf(str+(i*6),"[0x%02X]", txmessage.data[i]);
 		}
 		hal_info("[CEC] send message %s to %s (0x%02X>>0x%02X) '%s' (%s)\n",ToString((cec_logical_address)txmessage.initiator), txmessage.destination == 0xf ? "all" : ToString((cec_logical_address)txmessage.destination), txmessage.initiator, txmessage.destination, ToString((cec_opcode)txmessage.data[0]), str);
-		struct cec_msg msg;
-		cec_msg_init(&msg, txmessage.initiator, txmessage.destination);
-		memcpy(&msg.msg[1], txmessage.data, txmessage.length);
-		msg.len = txmessage.length + 1;
-		ioctl(hdmiFd, CEC_TRANSMIT, &msg);
+		if (hdmi_mode)
+		{
+			::write(hdmiFd, &txmessage, 2 + txmessage.length);
+		}
+		else
+		{
+			struct cec_msg msg;
+			cec_msg_init(&msg, txmessage.initiator, txmessage.destination);
+			memcpy(&msg.msg[1], txmessage.data, txmessage.length);
+			msg.len = txmessage.length + 1;
+			ioctl(hdmiFd, CEC_TRANSMIT, &msg);
+		}
 	}
 }
 
@@ -500,15 +533,28 @@ void hdmi_cec::Receive()
 	struct cec_message rxmessage;
 	struct cec_message txmessage;
 
-	struct cec_msg msg;
-	if (::ioctl(hdmiFd, CEC_RECEIVE, &msg) >= 0)
+	if (hdmi_mode)
 	{
-		rxmessage.length = msg.len - 1;
-		rxmessage.initiator = cec_msg_initiator(&msg);
-		rxmessage.destination = cec_msg_destination(&msg);
-		rxmessage.opcode = cec_msg_opcode(&msg);
-		memcpy(&rxmessage.data, &msg.msg[1], rxmessage.length);
-		hasdata = true;
+		if (::read(hdmiFd, &rxmessage, 2) == 2)
+		{
+			if (::read(hdmiFd, &rxmessage.data, rxmessage.length) == rxmessage.length)
+			{
+				hasdata = true;
+			}
+		}
+	}
+	else
+	{
+		struct cec_msg msg;
+		if (::ioctl(hdmiFd, CEC_RECEIVE, &msg) >= 0)
+		{
+			rxmessage.length = msg.len - 1;
+			rxmessage.initiator = cec_msg_initiator(&msg);
+			rxmessage.destination = cec_msg_destination(&msg);
+			rxmessage.opcode = cec_msg_opcode(&msg);
+			memcpy(&rxmessage.data, &msg.msg[1], rxmessage.length);
+			hasdata = true;
+		}
 	}
 
 	if (hasdata)
diff --git a/libarmbox/hdmi_cec.h b/libarmbox/hdmi_cec.h
index fb49137..3c32fa6 100644
--- a/libarmbox/hdmi_cec.h
+++ b/libarmbox/hdmi_cec.h
@@ -70,6 +70,7 @@ private:
 	void request_audio_status();
 	bool muted;
 	int volume;
+	bool hdmi_mode;
 protected:
 	bool running;
 public: