diff --git a/NANOVNA_STM32_F303/board.c b/NANOVNA_STM32_F303/board.c
index 82b9c2f..6ca71af 100644
--- a/NANOVNA_STM32_F303/board.c
+++ b/NANOVNA_STM32_F303/board.c
@@ -78,7 +78,7 @@ void __early_init(void) {
     // __enable_irq();
     // reset magic bytes
     *((unsigned long *)BOOT_FROM_SYTEM_MEMORY_MAGIC_ADDRESS) = 0;
-   #if 1
+   #if 0
     // https://stm32f4-discovery.net/2017/04/tutorial-jump-system-memory-software-stm32/
     // Step: Disable systick timer and reset it to default values
     #if 0
@@ -109,12 +109,22 @@ void __early_init(void) {
     //msp = *(uint32_t *) 0;
     msp = 0x20002250;
     #endif
+//    bootloader = (pFunction) 0x1FFFF796;
     __set_MSP(msp);
     bootloader();
     while(1);
    #else
-    __set_MSP(SYSTEM_BOOT_MSP); 
-    ( (void (*)(void)) (*((uint32_t *)(STM32F303xC_SYSTEM_MEMORY+4))) )();
+    __disable_irq();
+    uint32_t foo = SYSCFG->CFGR1;
+    foo = (foo & ~SYSCFG_CFGR1_MEM_MODE) || SYSCFG_CFGR1_MEM_MODE_0;
+    SYSCFG->CFGR1 = foo;
+    __DSB();
+    __ISB();
+
+      __set_MSP(*((uint32_t *)(STM32F303xC_SYSTEM_MEMORY)));
+      ((void (*)(void))(*((uint32_t *)(STM32F303xC_SYSTEM_MEMORY + 4))))(); // jump to DFU
+      //    __set_MSP(SYSTEM_BOOT_MSP);
+      //    ( (void (*)(void)) (*((uint32_t *)(STM32F303xC_SYSTEM_MEMORY+4))) )();
     while(1);
    #endif
   }
diff --git a/nanovna.h b/nanovna.h
index 0ef510e..6c02c45 100644
--- a/nanovna.h
+++ b/nanovna.h
@@ -84,6 +84,7 @@
 #define __LIMITS__
 #define __CURVE_EDIT__
 #ifdef TINYSA3
+#define __HAS_DFU__
 #define __MCU_CLOCK_SHIFT__
 #endif
 #ifdef TINYSA4
@@ -1176,7 +1177,6 @@ typedef struct setting
   uint8_t atten_step;          //  0...1 !!! need convert to bool
   int8_t _active_marker;       // -1...MARKER_MAX
   uint8_t unit_scale_index;    // table index
-  uint8_t repeat;              // 1...100
   uint8_t noise;               // 2...50
   uint8_t lo_drive;            // 0-3 , 3dB steps
   uint8_t rx_drive;            // 0-15 , 7=+20dBm, 3dB steps
@@ -1186,6 +1186,7 @@ typedef struct setting
   uint8_t  _traces;            // enabled traces flags
   uint8_t   draw_line;          // uses the trigger level setting
 
+  uint16_t repeat;              // 1...100
   uint16_t linearity_step;     // range equal POINTS_COUNT
   uint16_t _sweep_points;
   int16_t attenuate_x2;        // 0...60 !!! in calculation can be < 0
@@ -1391,7 +1392,7 @@ typedef struct properties {
 //sizeof(properties_t) == 0x1200
 
 #define CONFIG_MAGIC 0x434f4e60 /* 'CONF' */
-#define SETTING_MAGIC 0x434f4e60
+#define SETTING_MAGIC 0x434f4e61
 
 extern int16_t lastsaveid;
 //extern properties_t *active_props;
diff --git a/sa_core.c b/sa_core.c
index 20aa93f..51a26d2 100644
--- a/sa_core.c
+++ b/sa_core.c
@@ -1083,17 +1083,17 @@ void set_modulation_frequency(int f)
     f = 50;
   if (f > 10000)
     f = 10000;
-//#ifdef TINYSA4
-//  if (setting.modulation == MO_WFM && f > 2000)
-//    f = 2000;
-//#endif
+#ifdef TINYSA4
+  if (setting.modulation == MO_WFM && f > 3500)
+    f = 3500;
+#endif
   setting.modulation_frequency = f;
   dirty = true;
 }
 
 void set_repeat(int r)
 {
-  if (r > 0 && r <= 500) {
+  if (r > 0 && r <= 10000) {
     setting.repeat = r;
 //    dirty = true;             // No HW update required, only status panel refresh
   }
diff --git a/ui.c b/ui.c
index c9961ab..53a1a30 100644
--- a/ui.c
+++ b/ui.c
@@ -666,7 +666,7 @@ extern const char *states[];
   lcd_set_font(FONT_SMALL);
 }
 
-#ifndef TINYSA4
+#ifdef __HAS_DFU__
 void
 enter_dfu(void)
 {
@@ -2143,7 +2143,7 @@ static UI_FUNCTION_CALLBACK(menu_config_cb)
   redraw_frame();
   request_to_redraw_grid();
 }
-#ifndef TINYSA4
+#ifdef __HAS_DFU__
 static UI_FUNCTION_CALLBACK(menu_dfu_cb)
 {
   (void)data;
@@ -3882,7 +3882,7 @@ static const menuitem_t  menu_modulation[] = {
   { MT_FORM | MT_ADV_CALLBACK | MT_LOW, MO_AM,      "AM",    menu_modulation_acb},
 #ifdef TINYSA4
   { MT_FORM | MT_ADV_CALLBACK, MO_WFM,              "FM",               menu_modulation_acb},
-  { MT_FORM | MT_KEYPAD,   KM_MODULATION,           "FREQ: %s",         "50Hz..5kHz"},
+  { MT_FORM | MT_KEYPAD,   KM_MODULATION,           "FREQ: %s",         "50Hz..3.5kHz"},
   { MT_FORM | MT_KEYPAD,   KM_DEPTH,               "AM DEPTH: %s%%",         "0..100"},
   { MT_FORM | MT_KEYPAD,   KM_DEVIATION,            "FM DEVIATION: %s",         "1kHz..300kHz"},
 //  { MT_FORM | MT_ADV_CALLBACK, MO_NFM2,              MT_CUSTOM_LABEL,    menu_modulation_acb},
@@ -4097,7 +4097,7 @@ static const menuitem_t menu_marker[] = {
   { MT_NONE,     0, NULL, menu_back} // next-> menu_back
 };
 
-#ifndef TINYSA4
+#ifdef __HAS_DFU__
 static const menuitem_t menu_dfu[] = {
   { MT_FORM | MT_CALLBACK, 0, "ENTER DFU",      menu_dfu_cb},
   { MT_FORM | MT_NONE,     0, NULL, menu_back} // next-> menu_back
@@ -4502,14 +4502,14 @@ static const menuitem_t menu_config[] = {
 #ifdef __SPUR__
   { MT_ADV_CALLBACK,0,          "%s",          menu_spur_acb},
 #endif
-  { MT_KEYPAD, KM_REPEAT,       "SAMPLE REP\n\b%s",    "1..100"},
+  { MT_KEYPAD, KM_REPEAT,       "SAMPLE REP\n\b%s",    "1..10000"},
 #ifdef __LCD_BRIGHTNESS__
   { MT_ADV_CALLBACK, 0, "BRIGHTNESS\n \b%d%%", menu_brightness_acb},
 #endif
 #ifdef __USE_RTC__
   { MT_SUBMENU,  0, "DATE\nTIME", menu_date_time},
 #endif
-#ifndef TINYSA4
+#ifdef __HAS_DFU__
   { MT_SUBMENU,  0, S_RARROW" DFU",  menu_dfu},
 #endif
   { MT_SUBMENU,  0, S_RARROW"MORE", menu_config2},