Can’t seem to flash this thing. I’m following the instructions from @blakadder. I’m connecting GPIO0 to GND while plugging it in to USB power, the board shows nothing happening (whereas if not the GPIO0 is not connected to GND the blue leds around the perimeter start to flash).
After about 15 seconds, I remove that and connect the TX/RX serial on to RXD0/TXD0 pads (jumper wires, holding them in place firmly). I’ve tried flashing with Tasmota and also ESPHome (via Chrome), both give me the same /similar error: “Failed to initialize. Try resetting your device or holding the BOOT button while selecting your serial port until it starts preparing the installation.”. I’ve used this same procedure to flash many Sonoff devices, so I know it was working recently. Am I missing something maybe?
Update: I soldered to the pads and used the serial adapter for power as shown here. Again I’m able to get to the point where the board does not light up when connected to 3.3V (which I believe indicates the ESP is in flash mode), but I’m still getting errors when trying to flash it. Also, soldering to those tiny pads is tricky, I mangled the GPIO0 pad and ended up having to go straight to the ESP’s pin, props to all of you that have soldered this up, I need more practice.
