diff --git a/drivers/st7789/st7789_16bit.py b/drivers/st7789/st7789_16bit.py
index f93fd40..e3c0c1e 100644
--- a/drivers/st7789/st7789_16bit.py
+++ b/drivers/st7789/st7789_16bit.py
@@ -49,6 +49,7 @@ _ST7789_DISPON = b"\x29"
 _ST7789_CASET = b"\x2a"
 _ST7789_RASET = b"\x2b"
 _ST7789_RAMWR = b"\x2c"
+_ST7789_WRMEMC = b"\x3c"
 _ST7789_VSCRDEF = b"\x33"
 _ST7789_COLMOD = b"\x3a"
 _ST7789_MADCTL = b"\x36"
@@ -261,27 +262,28 @@ class ST7789(framebuf.FrameBuffer):
         self._cs(1)
 
     # Asynchronous refresh with support for reducing blocking time.
-    async def ddo_refresh(self, split=5):
+    async def do_refresh(self, split=5):
         async with self._lock:
             lines, mod = divmod(self.height, split)  # Lines per segment
             if mod:
                 raise ValueError("Invalid do_refresh arg.")
-            #clut = ST7789.lut
-            wd = -(-self.width // 2)
-            lb = memoryview(self._linebuf)
-            cm = self._gscale  # color False, greyscale True
+
+            bw = self.width * 2
+            end = self.height * self.width * 2
             buf = self.mvb
+
             line = 0
             for n in range(split):
                 if self._spi_init:  # A callback was passed
                     self._spi_init(self._spi)  # Bus may be shared
+
                 self._dc(0)
                 self._cs(0)
-                self._spi.write(b"\x3c" if n else b"\x2c")  # RAMWR/Write memory continue
+                self._spi.write(_ST7789_WRMEMC  if n else _ST7789_RAMWR)  # RAMWR/Write memory continue
                 self._dc(1)
-                for start in range(wd * line, wd * (line + lines), wd):
-                    #_lcopy(lb, buf[start:], 0xffff, wd, cm)  # Copy and map colors
-                    self._spi.write(buf[start : start + wd])
+
+                for start in range(bw * line, bw * (line + lines), bw):
+                    self._spi.write(buf[start : start + bw])
                 line += lines
                 self._cs(1)
                 await asyncio.sleep(0)
diff --git a/gui/widgets/color_bitmap.py b/gui/widgets/color_bitmap.py
index 0d242a5..51813e4 100644
--- a/gui/widgets/color_bitmap.py
+++ b/gui/widgets/color_bitmap.py
@@ -9,14 +9,14 @@
 from gui.core.ugui import Widget
 from gui.core.colors import *
 from gui.core.ugui import ssd
-import struct
 
-def little_to_big_endian(value):
-    # A Helper function to convert 16 bit int from little to big endian
-    # Pack the value as little-endian
-    packed = struct.pack(f'<H', value)
-    # Unpack it as big-endian
-    return struct.unpack(f'>H', packed)[0]
+
+def transform_palette(color565):
+    # change endian of the color from little to BIG
+    col = (color565 & 0xFF00) >> 8 | color565  << 8
+    # invert bitwise
+    return col ^ 0xffff
+
 
 class ColorBitMap(Widget):
 
@@ -36,7 +36,8 @@ class ColorBitMap(Widget):
 
     # Transform palette to match display color format
     # this will be run for with all image palette members
-    palette_transformer_cb = lambda self, x: ~little_to_big_endian(x) & 0xffff
+    # I did not find good way of changing other than class variable.
+    palette_transformer_cb =  staticmethod(transform_palette)
 
     def show(self):
         if not super().show(True):  # Draw or erase border
diff --git a/utils/image_converter.py b/utils/image_converter.py
index 9d50782..ec4ce8b 100755
--- a/utils/image_converter.py
+++ b/utils/image_converter.py
@@ -58,7 +58,7 @@ def rgb_to_color565(r, g, b):
         int: Converted color value in the 16-bit color format (565).
     """
 
-    return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b & 0xF8)
+    return ((r & 0xF8) << 8) | ((g & 0xFC) << 3) | (b >> 3)
 
 
 def convert_to_bitmap(image_file, bits_requested):