Flashing SMTONOFF 63A Power Monitoring DIN Relay (SMT002)

It’s quite difficult
1 - you must remove the 4 rivets holding the 2 sides together
2 - remove the 2 cable connectors from the PCB, remove the button and 2 light guides, then lift and flip the pcb
3 on the backside locate the ESP 8285 and using the pinout below solder 4 wires to 3.3V, GND, TX and RX. Tip: use GND form the power button, easier to access
warning: the pins are VERY small, it’s a difficult job as 3.3V, TX, RX are next to each other

Photos are priceless, so here they are:

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