You need to see in your flasher which pin is the 3.3v, they should be labeled. Then look at the router's board and identify the UART 4 pins, one of them says 3.3v (it's the one you DON'T use when accessing the console).
Refer to the following picture I took when I flashed mine:
As what happened to Roger, I also needed to connect those 2 pins along with placing the clamp that comes with the flasher on the chip, or else the flasher wouldn't detect the chip. To perform that connection I used a a dupont jumper wire (female to female), which I had to buy separately, but these are also dirt cheap - this along with the male pins that also came with the flasher and that I placed on the board's UART pin holes (didn't need to solder them, as long as they made contact).
Side note: my flasher also has a TTL UART mode, there is a jumper connector in it so I can alternate between TTL UART mode and SPI flashing mode (so I don't need a separate TTL UART adapter to access the router's console). Yours probably will have the same feature, if so then make sure you are in the correct mode for what you are doing.
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