This is a modified design of the socket done by tropics for my use. ( https://www.thingiverse.com/thing:812793 )

And the circuit for the tester on the photo is here. https://circuits.io/circuits/2694992-esp8266-test-board-1-1

There is a flash rom updater on this link. You can upload your own binary to the ESP8266 with this tool & USB FTDI connection. https://github.com/nodemcu/nodemcu-flasher