[Solved] Need help in reversing the secure bootloader

ArduCopter Copter 4.3
1

Hello Everyone,

I need some help in reversing the secure boot.

I was following the process of securing the firmware on my CubeOrange on Win11 using WSL1 Ubuntu 22.04 distribution. After following the process of building and uploading the secure bootloader, I flashed it using mavproxy.

Now to verify, I followed the Windows procedure of checking the string. It does show the secure string but now I am not able to boot up the device. As mentioned in the doc, I assume it is a bootloader cycle which is failing the boot check.

It would be great if someone to guide me through reverting the device back to its original state.

Note: I used Copter-4.3.5 to build the secure boot.

Thanks.

Update

I uploaded the Signed firmware again using the process mentioned in the documentation. This time the system did upload and boot as expected.

2

Have you flashed firmware signed with a key that’s onboard?

3

Yes, I generated the keys and used those to flash the firmware. To verify, I tried to install a firmware from the Mission Planner which helped to give the secure string in device manager

4

I would try standard update procedure with your signed firmware. Other than that it looks like your only venue is contacting dev team and getting help from the designated developer.

5

Alright, thank you for helping out.

6

I am also doing same process, but I am not able to flash the bootloader.
Once firmware become secure, I can’t connect it through MAVProxy/Mission Planeer/ QGC.

[45820.211631] usb 1-2: Product: CubeOrange±Secure-BL-v10

[45820.211633] usb 1-2: Manufacturer: CubePilot

[45820.212309] usb 1-2: SerialNumber: 2F0052001851313334373032

[45820.221937] cdc_acm 1-2:1.0: ttyACM4: USB ACM device

eshma@Myubuntu:~/coptor4.3.5/ardupilot-Copter-4.3.5$ mavproxy.py --master=/dev/ttyACM4

Connect /dev/ttyACM4 source_system=255

Log Directory:

Telemetry log: mav.tlog

Waiting for heartbeat from /dev/ttyACM4

MAV>
Pl
MAV> link 1 down

Can you please let me how you flashed bootloader?

7

Hey! @Vidya_Patil
Did you find the solution for that?

8

Hi, are you able to solve this issue?
I am also facing the same issue and want to solve it.
Can you please let me know if you find any ways for this?

9

Hi @shah_gaurang did you made any progress in this issue?

10

still not getting any replays and I am also looking for proper steps to follow

11

how are you flashing the bootloader?

12

I am following these steps. Linking Error into SecureBootloader

as I think it is related to memory linking. these steps are working fine with other flight controllers like kakuteh7, cubeorange. I am only getting errors in CubeOrangePlus.