Ardusub not downloading

Hello I tried upgrading my pixhawk 3DR firmware using qgc and i keep getting this error
Found device: ArduPilot ChibiOS

Connected to bootloader:

Version: 5

Board ID: 9

Flash size: 1032192

Downloading firmware…

From: https://firmware.ardupilot.org/Sub/stable/Pixhawk1/ardusub.apj

Download complete

MAV_AUTOPILOT = 12

Firmware file missing parameter_xml_size key

Firmware file missing airframe_xml_size key

Successfully decompressed image

Image size of 1369188 is too large for board flash size 1032192

Upgrade cancelled

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