@herbert.pan-Q I cannot upgrade the chip set BC660K-GL. I’m using the latest Qflash software available (V6.9). Here on this screenshot, the left side is the debug port. I press down the boot button, reset the device and wait while holding the boot button. It times out every time. I’ve selected the appropriate baud rate/main port configuration. These files are all up to date, and are provided by the support team.
I tried that but the result is the same. Is there a way to send at+qsclk=0 and save that to the memory of the device? It defaults to sleep mode every time I boot it. If I could save the sleep mode parameter; maybe then I could start the device in the download mode