diff --git a/bootloader/mrobe500.c b/bootloader/mrobe500.c
index 34814ba8d5..3663612c74 100755
--- a/bootloader/mrobe500.c
+++ b/bootloader/mrobe500.c
@@ -98,8 +98,8 @@ void touchpad_calibrate_screen(void)
     set_calibration_points(&tl, &br);
 }
 #endif
-static const uint8_t bl_low [] = {0xa4, 0x00, 0x55, 0xbb};
-static const uint8_t bl_high[] = {0xa4, 0x00, 0x19, 0xbb};
+static uint8_t bl_command[] = {0xa4, 0x00, 0x00, 0xbb};
+int brightness = 0;
 
 void mrdebug(void)
 {
@@ -130,10 +130,15 @@ void mrdebug(void)
             address+=0x1000;
         else if (button==BUTTON_RC_REW)
             address-=0x1000;
-        else if (button==BUTTON_RC_VOL_DOWN)
-            spi_block_transfer(SPI_target_BACKLIGHT, bl_low, 4, 0, 0);
-        else if (button==BUTTON_RC_VOL_UP)
-            spi_block_transfer(SPI_target_BACKLIGHT, bl_high, 4, 0, 0);
+        else if (button==BUTTON_RC_VOL_DOWN) {
+            brightness = (brightness - 5) & 0x7f;
+            bl_command[2] = brightness;
+            spi_block_transfer(SPI_target_BACKLIGHT, bl_command, 4, 0, 0);
+        } else if (button==BUTTON_RC_VOL_UP) {
+            brightness = (brightness + 5) & 0x7f;
+            bl_command[2] = brightness;
+            spi_block_transfer(SPI_target_BACKLIGHT, bl_command, 4, 0, 0);
+        }
 //         {
 //             short x,y,z1,z2;
 //             tsc2100_read_values(&x, &y, &z1, &z2);
diff --git a/firmware/export/config-mrobe500.h b/firmware/export/config-mrobe500.h
index 4a8834c1a2..850a2e83a1 100644
--- a/firmware/export/config-mrobe500.h
+++ b/firmware/export/config-mrobe500.h
@@ -92,11 +92,10 @@
 #define HAVE_BACKLIGHT_BRIGHTNESS
 
 /* Main LCD backlight brightness range and defaults */
-#define MIN_BRIGHTNESS_SETTING          0   /* 0.5 mA */
-#define MAX_DIM_BRIGHTNESS_SETTING      15  /* highest 'dimness' */
-#define MAX_BRIGHTNESS_SETTING          63  /* 32 mA */
-#define DEFAULT_BRIGHTNESS_SETTING      39  /* 20 mA */
-#define DEFAULT_DIMNESS_SETTING          9  /* 5 mA */
+#define MIN_BRIGHTNESS_SETTING          0
+#define MAX_BRIGHTNESS_SETTING          127
+#define DEFAULT_BRIGHTNESS_SETTING      85 /* OF "full brightness" */
+#define DEFAULT_DIMNESS_SETTING         22 /* OF "most dim" */
 
 /* Define this if you have a software controlled poweroff */
 #define HAVE_SW_POWEROFF
@@ -104,9 +103,7 @@
 /* The number of bytes reserved for loadable codecs */
 #define CODEC_SIZE 0x80000
 
-/* The number of bytes reserved for loadable plugins 
- *   - larger than other targets due to screen size
- */
+/* The number of bytes reserved for loadable plugins */
 #define PLUGIN_BUFFER_SIZE 0x100000
 
 /* Define this if you have the WM8975 audio codec */
diff --git a/firmware/target/arm/tms320dm320/mrobe-500/backlight-mr500.c b/firmware/target/arm/tms320dm320/mrobe-500/backlight-mr500.c
index 3c80ede00d..b570f3e8fc 100644
--- a/firmware/target/arm/tms320dm320/mrobe-500/backlight-mr500.c
+++ b/firmware/target/arm/tms320dm320/mrobe-500/backlight-mr500.c
@@ -24,27 +24,34 @@
 #include "backlight.h"
 #include "lcd.h"
 #include "power.h"
+#include "spi-target.h"
 
 void __backlight_on(void)
 {
+    __backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
 }
 
 void __backlight_off(void)
 {
+    __backlight_set_brightness(0);
 }
 
 /* Assumes that the backlight has been initialized */
 void __backlight_set_brightness(int brightness)
 {
-   (void) brightness;
+    uint8_t bl_command[] = {0xa4, 0x00, brightness, 0xbb};
+    spi_block_transfer(SPI_target_BACKLIGHT, bl_command, 4, 0, 0);
 }
 
 void __backlight_dim(bool dim_now)
 {
-    (void) dim_now;
+    __backlight_set_brightness(dim_now ?
+        DEFAULT_BRIGHTNESS_SETTING :
+        DEFAULT_DIMNESS_SETTING);
 }
 
 bool __backlight_init(void)
 {
+    __backlight_set_brightness(DEFAULT_BRIGHTNESS_SETTING);
     return true;
 }