diff --git a/radio/src/gui/480x272/bitmapbuffer.cpp b/radio/src/gui/480x272/bitmapbuffer.cpp
index 3fe5b9c6e..67fb457e4 100644
--- a/radio/src/gui/480x272/bitmapbuffer.cpp
+++ b/radio/src/gui/480x272/bitmapbuffer.cpp
@@ -541,23 +541,23 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
 
   FRESULT result = f_open(&imgFile, filename, FA_OPEN_EXISTING | FA_READ);
   if (result != FR_OK) {
-    return NULL;
+    return nullptr;
   }
 
   if (f_size(&imgFile) < 14) {
     f_close(&imgFile);
-    return NULL;
+    return nullptr;
   }
 
   result = f_read(&imgFile, buf, 14, &read);
   if (result != FR_OK || read != 14) {
     f_close(&imgFile);
-    return NULL;
+    return nullptr;
   }
 
   if (buf[0] != 'B' || buf[1] != 'M') {
     f_close(&imgFile);
-    return NULL;
+    return nullptr;
   }
 
   uint32_t fsize  = *((uint32_t *)&buf[2]);
@@ -567,7 +567,7 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
   result = f_read(&imgFile, buf, len, &read);
   if (result != FR_OK || read != len) {
     f_close(&imgFile);
-    return NULL;
+    return nullptr;
   }
 
   uint32_t ihsize = *((uint32_t *)&buf[0]); /* more header size */
@@ -575,7 +575,7 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
   /* invalid header size */
   if (ihsize + 14 > hsize) {
     f_close(&imgFile);
-    return NULL;
+    return nullptr;
   }
 
   /* sometimes file size is set to some headers size, set a real size in that case */
@@ -585,7 +585,7 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
   /* declared file size less than header size */
   if (fsize <= hsize) {
     f_close(&imgFile);
-    return NULL;
+    return nullptr;
   }
 
   uint32_t w, h;
@@ -607,12 +607,12 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
       break;
     default:
       f_close(&imgFile);
-      return NULL;
+      return nullptr;
   }
 
   if (*((uint16_t *)&buf[0]) != 1) { /* planes */
     f_close(&imgFile);
-    return NULL;
+    return nullptr;
   }
 
   uint16_t depth = *((uint16_t *)&buf[2]);
@@ -622,7 +622,7 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
   if (depth == 4) {
     if (f_lseek(&imgFile, hsize-64) != FR_OK || f_read(&imgFile, buf, 64, &read) != FR_OK || read != 64) {
       f_close(&imgFile);
-      return NULL;
+      return nullptr;
     }
     for (uint8_t i=0; i<16; i++) {
       palette[i] = buf[4*i];
@@ -631,14 +631,14 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
   else {
     if (f_lseek(&imgFile, hsize) != FR_OK) {
       f_close(&imgFile);
-      return NULL;
+      return nullptr;
     }
   }
 
   BitmapBuffer * bmp = new BitmapBuffer(BMP_RGB565, w, h);
-  if (bmp == NULL || bmp->getData() == NULL) {
+  if (bmp == nullptr || bmp->getData() == nullptr) {
     f_close(&imgFile);
-    return NULL;
+    return nullptr;
   }
 
   uint32_t rowSize;
@@ -654,7 +654,7 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
           if (result != FR_OK || read != 4) {
             f_close(&imgFile);
             delete bmp;
-            return NULL;
+            return nullptr;
           }
           if (hasAlpha) {
             *dst = ARGB(pixel & 0xff, (pixel >> 24) & 0xff, (pixel >> 16) & 0xff, (pixel >> 8) & 0xff);
@@ -688,7 +688,7 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
         if (result != FR_OK || read != rowSize) {
           f_close(&imgFile);
           delete bmp;
-          return NULL;
+          return nullptr;
         }
         display_t * dst = bmp->getPixelPtr(0, i);
         for (uint32_t j=0; j<w; j++) {
@@ -703,7 +703,7 @@ BitmapBuffer * BitmapBuffer::load_bmp(const char * filename)
     default:
       f_close(&imgFile);
       delete bmp;
-      return NULL;
+      return nullptr;
   }
 
   f_close(&imgFile);
@@ -787,7 +787,7 @@ BitmapBuffer * BitmapBuffer::load_stb(const char * filename)
 {
   FRESULT result = f_open(&imgFile, filename, FA_OPEN_EXISTING | FA_READ);
   if (result != FR_OK) {
-    return NULL;
+    return nullptr;
   }
 
   int w, h, n;
@@ -795,7 +795,7 @@ BitmapBuffer * BitmapBuffer::load_stb(const char * filename)
   f_close(&imgFile);
 
   if (!img) {
-    return NULL;
+    return nullptr;
   }
 
   // convert to RGB565 or ARGB4444 format
@@ -803,7 +803,7 @@ BitmapBuffer * BitmapBuffer::load_stb(const char * filename)
   if (bmp == NULL) {
     TRACE("load_stb() malloc failed");
     stbi_image_free(img);
-    return NULL;
+    return nullptr;
   }
 
 #if 0