@ajb2k3 said in ATOM S3, How to switch to online programming mode?:

By pressing the screen on boot
My case, This is to enter programing mode. not come back to App mode.
My version is UIFlow2.0 Alpha28. what version did you success this way?

M5Burner to get into app mode
This doesn't work.
I did following step. Please advice if the step is wrong.

Open M5 burner and select ATOM S3. Connect USB to ATOM S3, hold reset button dew second until internal LED turn on. Click "Configure" of UIFlow2.0 Change Boot option to "Run main.py directly" Click next to burning the setting once window shows "success", remove USB from Atom S3 and re-connect

After this step, the program does not start.
The window is just black screen.
What version of UIFlow are you using?