Avatto smart plug flashing

HI, i bought this smart plug, used tuya convert to flash it, then i started to map pins. In process i managed to brick it. See (there are photos of inside)

I dismantled it now i have access to pins on little board with esp chip.
It seems to be this one
https://fccid.io/2AKBPESP8266-S3/User-Manual/User-Manual-3594791.html

But when connecting to pins 13 and 14, my usb flash device does not work.

ESP board is in top-right corner

Any clues?
thanks
Libor