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.