Timeout waiting for ACK/NACK after 'Synch (0x55 0x55)'

Hi, Im trying to do the python flash with the SSH, I’m doing it on the Home Assistant OS SSH,

Im getting this error …

/zigbee python3 cc2538-bsl.py -p /dev/ttyUSB0 -evw CC1352P2_CC2652P_launchpad_coordinator_20211217.hex
Opening port /dev/ttyUSB0, baud 500000
Reading data from CC1352P2_CC2652P_launchpad_coordinator_20211217.hex
Your firmware looks like an Intel Hex file
Connecting to target...
ERROR: Timeout waiting for ACK/NACK after 'Synch (0x55 0x55)

Thanks

[Hedda]

FYI, after updating several times and helping others with different setups I have broken down my tested steps to flash firmware mentioned from https://github.com/JelmerT/cc2538-bsl/pull/114 into this basic guide for flashing ITead SONOFF Zigbee 3.0 USB Dongle Plus adapter.

This guide uses the cc2538-bsl tool from JelmerT’s latest “master” branch on GitHub and could easily be made to work on all operating systems. I tested on Windows OS but others have done this on Linux and Mac OS by using different Serial/COM-port addressing as the steps should otherwise be the same.

1. Install Silabs CP210x device drivers (CP2102N USB-to-UART bridge / USB-to-Serial converter chip) needed for Windows OS and Mac OS, (this also required a reboot of my operating-system).
2. Install Python (in my case I installed and tested with Python for Windows 3.10.1).
3. Launch command-prompt (cmd.exe) as elevated Administrator. Upgrade pip with python -m pip install --upgrade pip, (if pip is not available then first run python -m ensurepip --upgrade), then pre-install dependencies fro cc2538-bsl from PyPi via pip command: pip install wheel pyserial intelhex python-magic
4. Optional but recommended: Download and install zigpy-znp via pip/PyPI with pip install zigpy-znp then perform NVRAM backup by following instructions in TOOLS.md (also find more details ZNP radio backup procedure at https://github.com/zigpy/zigpy/wiki/Coordinator-Backup-and-Migration) for Windows backup command should be something like python -m zigpy_znp.tools.nvram_read COM5 -o nvram_backup.json and optionally also backup Zigbee network via python -m zigpy_znp.tools.network_backup COM5 -o network_backup.json.
5. Download cc2538-bsl on GiHub from its “master” branch, (and not via pip/PyPI), unpact the zip to a folder then launch command-promt (cmd.exe) as elevated Administrator and run its setup.py to install its dependencies (should include “setuptools”, “wheel”, “pyserial”, “intelhex”, and “python-magic” packages).
6. Get latest firmware (I tested latest “CC1352P2_CC2652P_launchpad_*.zip” image available from its “master” branch at this time. Alternatively, you could get the latest “beta” version from the develop branch). Regardless make sure to get the correct image file as should be the one for “launchpad” (and not for “other)”!
7. Stop any applications or services that might be connected to the Zigbee adapter via serial port (ex. Home Assistant’s ZHA integration, Zigbee2MQTT, ioBroker, Jeedom, etc.). In my case, I ran the update on another computer so nothing to stop there.
8. Run command to flash from command-promt (cmd.exe) launched as elevated Administrator, example with firmware release available at this time: python cc2538-bsl.py -p COM5 -e -v -w --bootloader-sonoff-usb CC1352P2_CC2652P_launchpad_coordinator_20211217.hex

Obviously need to replace number in COM5 with the port # actually shown used under ports in Device Manager on Windows.

Also, if using Linux or Mac OS instead of Microsoft Windows then the COM# serial device path after -p will be different when set the port to use, (like for example /dev/ttyUSB0 or /dev/ttyUSB1) and might need different Silabs CP210x device drivers (CP2102N USB-to-UART bridge / USB-to-Serial converter chip) for your operating system, on Linux might have to run Python with sudo, and read that many on Linux successfully run sudo python cc2538-bsl.py -e -v -w --bootloader-sonoff-usb CC1352P2_CC2652P_launchpad_coordinator_20211217.hex without setting serial device path with -p for port to use.

[juan11perez]

@Hedda I had the same issue as @Rowleys. After adding --bootloader-sonoff-usb to the command, flashing completed successfully. I’ve added the feedback to 114 per your request.