diff --git a/boards/px4/fmu-v6xrt/nuttx-config/scripts/script.ld b/boards/px4/fmu-v6xrt/nuttx-config/scripts/script.ld
index dc05748b6adf..de0e2ac62d86 100644
--- a/boards/px4/fmu-v6xrt/nuttx-config/scripts/script.ld
+++ b/boards/px4/fmu-v6xrt/nuttx-config/scripts/script.ld
@@ -34,7 +34,7 @@
 
 MEMORY
 {
-  flash (rx)  : ORIGIN = 0x30020000, LENGTH = 4M-128K /* We have 64M but we do not want to wait to program it all */
+  flash (rx)  : ORIGIN = 0x30020000, LENGTH = 64M-128K /* We have 64M but we do not want to wait to program it all */
   sram  (rwx) : ORIGIN = 0x20240000, LENGTH = 2M-256k-512k
   itcm  (rwx) : ORIGIN = 0x00000000, LENGTH = 256K   /* TODO FlexRAM partition */
   dtcm  (rwx) : ORIGIN = 0x20000000, LENGTH = 256K
diff --git a/boards/px4/fmu-v6xrt/src/hw_config.h b/boards/px4/fmu-v6xrt/src/hw_config.h
index 19611e379cb6..46d9738e93a0 100644
--- a/boards/px4/fmu-v6xrt/src/hw_config.h
+++ b/boards/px4/fmu-v6xrt/src/hw_config.h
@@ -74,9 +74,9 @@
 #define BOARD_TYPE                     35
 // The board has a 64 Mb part with 16384, 4K secors, but we artificialy limit it to 4 Mb
 // as 1024, 4K sectors
-#define BOARD_FLASH_SECTORS            1024 // Really (16384)
+#define BOARD_FLASH_SECTORS            16383 // Really (16384 - 1)
 #define BOARD_FIRST_FLASH_SECTOR_TO_ERASE 32 // We resreve 128K for the bootloader
-#define BOARD_FLASH_SIZE               (4 * 1024 * 1024)
+#define BOARD_FLASH_SIZE               (64 * 1024 * 1024)
 
 #define OSC_FREQ                       24