diff --git a/radio/src/bootloader/boot.cpp b/radio/src/bootloader/boot.cpp
index f5906bf55..6c4516156 100644
--- a/radio/src/bootloader/boot.cpp
+++ b/radio/src/bootloader/boot.cpp
@@ -361,7 +361,7 @@ FRESULT openBinaryFile(uint32_t index)
   return f_read(&FlashFile, (BYTE *)Block_buffer, 4096, &BlockCount);
 }
 
-uint32_t isValidBufferStart(const uint32_t * buffer)
+uint32_t isValidBufferStart(const void * buffer)
 {
   if (memoryType == MEM_FLASH)
     return isFirmwareStart(buffer);
diff --git a/radio/src/targets/sky9x/flash_driver.cpp b/radio/src/targets/sky9x/flash_driver.cpp
index 5d3606395..b7f6d7f2a 100644
--- a/radio/src/targets/sky9x/flash_driver.cpp
+++ b/radio/src/targets/sky9x/flash_driver.cpp
@@ -56,8 +56,10 @@ void clearLockBits()
   }
 }
 
-uint32_t isFirmwareStart(uint32_t *block)
+uint32_t isFirmwareStart(const void * buffer)
 {
+  const uint32_t * block = (const uint32_t *)buffer;
+
   if ((block[0] & 0xFFFE3000) != 0x20000000 ) {
     return 0;
   }
diff --git a/radio/src/targets/taranis/board_taranis.h b/radio/src/targets/taranis/board_taranis.h
index 06b592c2a..a66004edf 100644
--- a/radio/src/targets/taranis/board_taranis.h
+++ b/radio/src/targets/taranis/board_taranis.h
@@ -145,8 +145,8 @@ void delay_01us(uint16_t nb);
 #define FLASH_PAGESIZE 256
 void unlockFlash();
 void writeFlash(uint32_t * address, uint32_t * buffer);
-uint32_t isFirmwareStart(const uint32_t *block);
-uint32_t isBootloaderStart(const uint32_t *block);
+uint32_t isFirmwareStart(const void * buffer);
+uint32_t isBootloaderStart(const void * buffer);
 
 // Pulses driver
 void init_no_pulses(uint32_t port);
diff --git a/radio/src/targets/taranis/flash_driver.cpp b/radio/src/targets/taranis/flash_driver.cpp
index 001b8e903..a57aac087 100644
--- a/radio/src/targets/taranis/flash_driver.cpp
+++ b/radio/src/targets/taranis/flash_driver.cpp
@@ -98,8 +98,10 @@ void writeFlash(uint32_t *address, uint32_t *buffer) // page size is 256 bytes
   }
 }
 
-uint32_t isFirmwareStart(const uint32_t *block)
+uint32_t isFirmwareStart(const void * buffer)
 {
+  const uint32_t * block = (const uint32_t *)buffer;
+
   if ((block[0] & 0xFFFC0000) != 0x20000000) {
     return 0;
   }
@@ -112,8 +114,10 @@ uint32_t isFirmwareStart(const uint32_t *block)
   return 1;
 }
 
-uint32_t isBootloaderStart(const uint32_t *block)
+uint32_t isBootloaderStart(const void * buffer)
 {
+  const uint32_t * block = (const uint32_t *)buffer;
+
   for (int i=0; i<256; i++) {
     if (block[i] == 0x544F4F42/*BOOT*/) {
       return 1;