Voxl ESC not responding and not detected

Jetson Nano

Hello @Vinny @Eric-Katzfey @Alex-Kushleyev @modaltb

I am facing an error with my Voxl FPV ESC. The ESC is not responding to any command. While plug in power the ESC is only blinking 3 LED for the initialization, then there is no LED blinking.
The ESC was working fine, during a flight test the motor suddenly stopped and the drone was landed safely somehow, but after that the motors are not starting, there are no visible damages.
I am attaching the terminal results, I tried to upgrade the firmware, alchange the parameter file, but the ESC is not responding. I also checked with various baudrate, the result is same, no response.

:~/Downloads/voxl-esc-master/voxl-esc-tools$ sudo python3 voxl-esc-scan.py
Detected Python version : 3.10.12 (main, Mar  3 2026, 11:56:32) [GCC 11.4.0]
Found voxl-esc tools bin version: 1.10
INFO: All COM ports:
	/dev/ttyUSB0 : FT232R USB UART - FT232R USB UART
INFO: UART Port Candidates:
	/dev/ttyUSB0
INFO: Scanning for ESC firmware: /dev/ttyUSB0, baud: 2000000
INFO: Scanning for ESC bootloader: /dev/ttyUSB0, baud: 230400
WARNING: No ESC(s) detected
INFO: All COM ports:
	/dev/ttyUSB0 : FT232R USB UART - FT232R USB UART
INFO: UART Port Candidates:
	/dev/ttyUSB0
INFO: Scanning for ESC firmware: /dev/ttyUSB0, baud: 250000
INFO: Scanning for ESC bootloader: /dev/ttyUSB0, baud: 230400
WARNING: No ESC(s) detected
INFO: All COM ports:
	/dev/ttyUSB0 : FT232R USB UART - FT232R USB UART
INFO: UART Port Candidates:
	/dev/ttyUSB0
INFO: Scanning for ESC firmware: /dev/ttyUSB0, baud: 921600
INFO: Scanning for ESC bootloader: /dev/ttyUSB0, baud: 230400
WARNING: No ESC(s) detected
INFO: All COM ports:
	/dev/ttyUSB0 : FT232R USB UART - FT232R USB UART
INFO: UART Port Candidates:
	/dev/ttyUSB0
INFO: Scanning for ESC firmware: /dev/ttyUSB0, baud: 57600
INFO: Scanning for ESC bootloader: /dev/ttyUSB0, baud: 230400
WARNING: No ESC(s) detected

ERROR: not all ESCs found

please help me out here, is there any way to figure out why is this happening and how to solve it, I had a similar instance earlier, but the ESC was responsive and one motor was glitching. it was stopping during rotation. changing motor did not help, so i changed the ESC and it worked.

what I do to maintain the ESC safety and working.

Jetson Nano

@Vinny @Eric-Katzfey @Alex-Kushleyev @modaltb
Hi Guys,
Any update would be great appreciated.

Alex Kushleyev

@Jetson-Nano ,

In a case like this, if the ESC works and suddenly stops working, the resulting state is probably a hardware problem (possibly caused by software action or hardware damage). In this state, it is probably impossible to recover the ESC using software and remote diagnostics would be difficult and you would probably not be able to fix the ESC hardware anyway.

Do you have any additional information that could help us understand what happened and the frequency of occurrence? you mentioned two occurrences "recently" -- any more details? What motor/prop/battery was used and was there anything unusual that happened during the test? Do you have a px4 log from the flight? (you could share it privately if needed).

If you are able to ship two failed ESC boards back to us for investigation, i'll ask our team if we can send you new replacement(s).

Alex