diff --git a/ili9341.c b/ili9341.c
index 5227be7..00b98e5 100644
--- a/ili9341.c
+++ b/ili9341.c
@@ -516,6 +516,12 @@ void ili9341_init(void)
     p += 2 + p[1];
     chThdSleepMilliseconds(2);
   }
+#ifdef TINYSA4
+  if (hwid >= 2) {
+    uint8_t data[] = {0};
+    send_command(0x21, 1, data);
+  }
+#endif
   ili9341_clear_screen();
   LCD_CS_HIGH;
 }
diff --git a/main.c b/main.c
index cb05fa3..57fe7d5 100644
--- a/main.c
+++ b/main.c
@@ -1980,21 +1980,28 @@ typedef struct version_t {
   const uint16_t min_adc;
   const uint16_t max_adc;
   const char *text;
+  const uint16_t hwid;
 } version_t;
 
-#define MAX_VERSION_TEXT    1
+#define MAX_VERSION_TEXT    2
 const version_t hw_version_text[MAX_VERSION_TEXT] =
 {
- { 165, 170,    "V0.4.5.1"}
+ { 165, 175,    "V0.4.5.1",     1},
+ { 180, 190,    "V0.4.5.1.1",   2}
 };
 
+uint16_t hwid = 0;
+
 const char *get_hw_version_text(void)
 {
   int v = adc1_single_read(0);
   for (int i=0; i<MAX_VERSION_TEXT;i++) {
-    if (hw_version_text[i].min_adc <= v && v <= hw_version_text[i].max_adc)
+    if (hw_version_text[i].min_adc <= v && v <= hw_version_text[i].max_adc) {
+      hwid = hw_version_text[i].hwid;
       return hw_version_text[i].text;
+    }
   }
+  hwid = 0;
   return "Unknown";
 }
 #endif
@@ -2830,6 +2837,9 @@ int main(void)
   /*
  * SPI LCD Initialize
  */
+#ifdef TINYSA4
+  (void) get_hw_version_text();     // This sets the hwid, must be before ili9341_init;
+#endif
   ili9341_init();
   PULSE
 
diff --git a/nanovna.h b/nanovna.h
index 5b3a5da..ef67248 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -253,7 +253,9 @@ extern freq_t maxFreq;
 #define STOP_MAX maxFreq
 
 extern const char TINYSA_VERSION[];
-
+#ifdef TINYSA4
+extern uint16_t hwid;
+#endif
 #define MAX_FREQ_TYPE 5
 enum stimulus_type {
   ST_START=0, ST_STOP, ST_CENTER, ST_SPAN, ST_CW, ST_DUMMY      // Last is used in marker ops