diff --git a/ConfigSettings.h b/ConfigSettings.h
index 82533af..e7a4a89 100644
--- a/ConfigSettings.h
+++ b/ConfigSettings.h
@@ -3,7 +3,7 @@
 #ifndef configsettings_h
 #define configsettings_h
 
-#define FW_VERSION "v1.4.2"
+#define FW_VERSION "v1.4.3"
 enum DeviceStatus {
   DS_OK = 0,
   DS_ERROR = 1,
diff --git a/Somfy.cpp b/Somfy.cpp
index 6778f74..e3328c8 100644
--- a/Somfy.cpp
+++ b/Somfy.cpp
@@ -48,6 +48,7 @@ somfy_commands translateSomfyCommand(const String& string) {
     else if (string.equalsIgnoreCase("Prog")) return somfy_commands::Prog;
     else if (string.equalsIgnoreCase("SunFlag")) return somfy_commands::SunFlag;
     else if (string.equalsIgnoreCase("StepUp")) return somfy_commands::StepUp;
+    else if (string.equalsIgnoreCase("StepDown")) return somfy_commands::StepDown;
     else if (string.equalsIgnoreCase("Flag")) return somfy_commands::Flag;
     else if (string.startsWith("mud") || string.startsWith("MUD")) return somfy_commands::MyUpDown;
     else if (string.startsWith("md") || string.startsWith("MD")) return somfy_commands::MyDown;
@@ -115,10 +116,13 @@ void somfy_frame_t::decodeFrame(byte* frame) {
     this->checksum = decoded[1] & 0b1111;
     this->encKey = decoded[0];
     // Pull in the 80-bit commands.  The upper nibble will be 0 even on 80 bit packets.
-    this->cmd = (somfy_commands)((decoded[1] >> 4) | ((decoded[8] & 0x08) << 4));
+    this->cmd = (somfy_commands)((decoded[1] >> 4));
+    // Pull in the data for an 80-bit step command.
+    if(this->cmd == somfy_commands::StepDown)
+      this->cmd = (somfy_commands)((decoded[1] >> 4) | ((decoded[8] & 0x08) << 4));
     this->rollingCode = decoded[3] + (decoded[2] << 8);
     this->remoteAddress = (decoded[6] + (decoded[5] << 8) + (decoded[4] << 16));
-    this->valid = this->checksum == checksum && this->remoteAddress < 16777215;
+    this->valid = this->checksum == checksum && this->remoteAddress < 16777215 && this->rollingCode > 0;
     if (this->valid) {
         // Check for valid command.
         switch (this->cmd) {
@@ -215,8 +219,8 @@ void somfy_frame_t::encodeFrame(byte *frame) {
   frame[9] = 29;
   switch(this->cmd) {
     case somfy_commands::StepUp:
-      frame[7] = 136;
-      frame[8] = 52;
+      frame[7] = 132;
+      frame[8] = 56;
       frame[9] = 22;
       break;
     case somfy_commands::StepDown:
@@ -1449,6 +1453,7 @@ void SomfyRemote::sendCommand(somfy_commands cmd, uint8_t repeat) {
   frame.cmd = cmd;
   frame.repeats = repeat;
   frame.bitLength = this->bitLength;
+  frame.encKey = 0xA0 | static_cast<uint8_t>(frame.rollingCode & 0x000F);
   if(frame.bitLength == 0) frame.bitLength = bit_length;
   this->lastRollingCode = frame.rollingCode;
   somfy.sendFrame(frame, repeat);
@@ -1646,7 +1651,6 @@ void Transceiver::sendFrame(byte *frame, uint8_t sync, uint8_t bitLength) {
   REG_WRITE(GPIO_OUT_W1TC_REG, pin);
   delayMicroseconds(SYMBOL);
   // Data: bits are sent one by one, starting with the MSB.
-  // TODO: Handle the 80-bit send protocol
   for (byte i = 0; i < bitLength; i++) {
     if (((frame[i / 8] >> (7 - (i % 8))) & 1) == 1) {
       REG_WRITE(GPIO_OUT_W1TC_REG, pin);
diff --git a/Somfy.h b/Somfy.h
index 5a85298..ea1aa66 100644
--- a/Somfy.h
+++ b/Somfy.h
@@ -22,13 +22,13 @@ enum class somfy_commands : byte {
     Prog = 0x8,
     SunFlag = 0x9,
     Flag = 0xA,
-    StepUp = 0xB,
+    StepDown = 0xB,
     UnknownC = 0xC,
     UnknownD = 0xD,
-    UnknownE = 0xE,
+    UnknownE = 0xE, // This command byte has been witnessed in the wild but cannot tell if it is from Somfy.  No rolling code is sent with this and it is 56-bits.
     UnknownF = 0xF,
     // Command extensions for 80 bit frames
-    StepDown = 0x8B
+    StepUp = 0x8B
 };
 enum class shade_types : byte {
   roller = 0x00,
diff --git a/SomfyController.ino.esp32.bin b/SomfyController.ino.esp32.bin
index ecab614..2e2454c 100644
Binary files a/SomfyController.ino.esp32.bin and b/SomfyController.ino.esp32.bin differ
diff --git a/SomfyController.littlefs.bin b/SomfyController.littlefs.bin
index ea9ad6c..4bff626 100644
Binary files a/SomfyController.littlefs.bin and b/SomfyController.littlefs.bin differ
diff --git a/data/appversion b/data/appversion
index e21e727..3c80e4f 100644
--- a/data/appversion
+++ b/data/appversion
@@ -1 +1 @@
-1.4.0
\ No newline at end of file
+1.4.3
\ No newline at end of file
diff --git a/data/index.html b/data/index.html
index 9ec8a5a..6f449aa 100644
--- a/data/index.html
+++ b/data/index.html
@@ -3,10 +3,10 @@
 <head>
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <meta charset="UTF-8">
-    <link rel="stylesheet" href="main.css?v=1.4.2" type="text/css" />
-    <link rel="stylesheet" href="icons.css?v=1.4.2" type="text/css" />
+    <link rel="stylesheet" href="main.css?v=1.4.3" type="text/css" />
+    <link rel="stylesheet" href="icons.css?v=1.4.3" type="text/css" />
     <link rel="icon" type="image/png" href="favicon.png" />
-    <script type="text/javascript" src="index.js?v=1.4.2"></script>
+    <script type="text/javascript" src="index.js?v=1.4.3"></script>
 </head>
 <body>
     <div id="divContainer" class="container" style="user-select:none;position:relative;border-radius:27px;">
diff --git a/data/index.js b/data/index.js
index f2ea0c2..4e78a50 100644
--- a/data/index.js
+++ b/data/index.js
@@ -372,7 +372,7 @@ async function reopenSocket() {
     await initSockets();
 }
 class General {
-    appVersion = 'v1.4.2';
+    appVersion = 'v1.4.3';
     reloadApp = false;
     async init() {
         this.setAppVersion();