Signed Bootloader uploaded but firmware is not accepted after flashing Chibios from QGC

ArduCopter Copter 4.0
1

After uploading signed bootloader to pixhawk4 via QGC by selecting the Chibios flash from advanced option, the bootloader changed to secure bootloader but firmware not accepted.

2

Follow the steps here: Creating Tamperproof Firmware — Dev documentation

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