CPU Core can be running during flash

[chanqueo]

As documented, JLink.halted() method can raise an exception, leading in the method JLink.halt() not called.

        try:
            # Stop the target before flashing.  This is required to be in a
            # try-catch as the 'halted()' check may fail with an exception.
            if not self.halted():
                self.halt()
        except errors.JLinkException:
            pass

Why not calling JLink.halt() systematicaly?

[hkpeprah]

Do you mean call .halt() independent of the halted status?

[chanqueo]

Yes exactly