I hope I am at the right place.
I used some old design I found out on the internet a few years ago, to make an Ameba Realtek writer. My goal is to use it for uploading sketches through Arduino IDE. But, I get stuck at the very first step.
This is the schematic.
As I was short of some components I used 22pF instead of 20pF for C2 and C3 and 1.8K instead of 1.5K for R5. The rest is as it is.
When I plug this board into a PC I can see it in my Device Manager as unrecognized (unknown). So far so good.
The next step is to upload a new firmware from an Amebaiot site. To do so, I need to put it in a drive mode with two buttons. This is the place I stuck. By clicking buttons as it shows on the site I provide, it cannot mount as a drive.
What I mess up?