windix When flushing the firmware both USB-TTL and MicroUSB (or the power pins) need to be plugged in. Since USB-TTL also offers 3v3 can we make use of that? Currently the VCC pin is unconnected. Take the common red FT232RL as example: 6 GND 5 CTS - unconnected 4 VCC - unconnected 3 TX 2 RX 1 DTR
uli The regulators on the USB-serial converters I have are not strong enough to power the ESP module, so it won't work without a proper external supply.