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@gwennelsonuk I'm just annoyed that he's using a CH341a, without modification. That means the data lines are being driven at a 5V logic level.

The router he's hacking on may very well be 1.8v, as many of them are nowadays, though even a 3..3v one will be fried.

At least get the green ch341a, rev 1.7, which has a switch for 1.8/3.3/5v.

A raspberry pi pico is the best flasher. Nobody really uses 5v. Pico is 3.3v and you can use a 1.8<>3.3v logic level shifter if you wish, for 1.8v electronics.