diff --git a/firmware/bootloader/openblt_chibios/openblt_flash.cpp b/firmware/bootloader/openblt_chibios/openblt_flash.cpp
index 4a498f9e38..1e6084bf62 100644
--- a/firmware/bootloader/openblt_chibios/openblt_flash.cpp
+++ b/firmware/bootloader/openblt_chibios/openblt_flash.cpp
@@ -19,12 +19,22 @@ blt_addr FlashGetUserProgBaseAddress() {
 }
 
 blt_bool FlashWrite(blt_addr addr, blt_int32u len, blt_int8u *data) {
+	// don't allow overwriting the bootloader
+	if (addr < FlashGetUserProgBaseAddress()) {
+		return BLT_FALSE;
+	}
+
 	return (FLASH_RETURN_SUCCESS == intFlashWrite(addr, (const char*)data, len)) ? BLT_TRUE : BLT_FALSE;
 
 	return BLT_TRUE;
 }
 
 blt_bool FlashErase(blt_addr addr, blt_int32u len) {
+	// don't allow erasing the bootloader
+	if (addr < FlashGetUserProgBaseAddress()) {
+		return BLT_FALSE;
+	}
+
 	if (!intFlashIsErased(addr, len)) {
 		return (FLASH_RETURN_SUCCESS == intFlashErase(addr, len)) ? BLT_TRUE : BLT_FALSE;
 	}