Hi.

I have a Axpert King 1 5KW with a display running a GigaDevice chip. I updated the firmware (02.89) and it stated successful. Once I power cycled it, the screen does not turn on. No light nothing, just dead.

I am sure I flashed the wrong firmware (for the ST chips). My other inverters have the st chip but the newer ones I bought has the GigaDevice.

Is there a way to reflash it with the latest compatible firmware (looks like 02.83)?

Any advice would be appreciated.

Hi,

you can use ST-Link (or any other SWD probe) to reflash the chip with the right firmware. Check this thread for SWD pinout:

https://powerforum.co.za/topic/14829-easun-axpert-max-8kw-firmware/page/5/#findComment-140679

No external power is needed, the SWD probe will provide +3.3V for the device.

First of all, make a full backup of the flash memory. You'll need it to extract the bootloader which is not included in the upgrade file.

I like to use OpenOCD for this but you can choose any other tool except STM32CubeProgrammer, which won't probably work with a GigaDevice chip.

After successfully connecting, run the backup using telnet:

The file will be stored in the directory where OpenOCD is running, /OpenOCD-20251211-0.12.0/share/openocd/scripts/ in my case. Size of the flash memory (0x40000) may differ in your case, check the datasheet of your chip. 0x8000000 is where the flash starts. It's the same for all STM32's and clones.

Once you have the backup, post it here and I'll merge the bootloader with the proper firmware you need so you can flash it into the chip.

Thanks for the guidance. I took a working panel, made a fimware dump using stm32cubeprog and blew the backup to the dead unit. All working fine now.

Thanks!