Where is gpio0 for entering firmware flash mode for sonoff t0 us?

Hardware
1

Where is gpio0 for entering firmware flash mode for sonoff t0 us? Has anyone ever flashed it?

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2

Isn’t the ESP on the other side of the board?

3

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4

Found this
Sonoff TX T0 US 3 Gang Switch (T0US3C) Configuration for Tasmota (blakadder.com)

Sonoff Touch Smart Switch T0US3C - Hardware - Home Assistant Community (home-assistant.io)

5

None of those links are correct for V2.0.1, GPIO0 is at TP1 Key0