Can't manage to program 328pb on custom PCB-Board via TTL

Which setting did you have selected from the Tools > Bootloader menu when you did that?

Which header on the board is the RX and TX pins of your USB to serial adapter connected to?

I'm going to ask you to post the full verbose output from an upload attempt.


:exclamation: This procedure is not intended to solve the problem. The purpose is to gather more information.


Please do this:

  1. Select File > Preferences... (or Arduino IDE > Settings... for macOS users) from the Arduino IDE menus.
    The "Preferences" dialog will open.
  2. Uncheck the box next to Show verbose output during: compilation in the "Preferences" dialog.
  3. Check the box next to Show verbose output during: ☐ upload.
  4. Click the "OK" button.
  5. Attempt an upload, as you did before.
  6. Wait for the upload to fail.
  7. You will see a "Upload error: ..." notification at the bottom right corner of the Arduino IDE window. Click the "COPY ERROR MESSAGES" button on that notification.
  8. Open a forum reply here by clicking the "Reply" button.
  9. Click the <CODE/> icon on the post composer toolbar.
    This will add the forum's code block markup (```) to your reply to make sure the error messages are correctly formatted.
    Code block icon on toolbar
  10. Press the Ctrl+V keyboard shortcut (Command+V for macOS users).
    This will paste the error output from the upload into the code block.
  11. Move the cursor outside of the code block markup before you add any additional text to your reply.
  12. Click the "Reply" button to post the output.


I saw from the other thread you said:

Did you ever solder the oscillator?

Were you using MiniCore? If so, please tell me what you had selected from the following Arduino IDE menus:

  • Tools > Bootloader
  • Tools > Clock