Hi,
If you have Robotdyn Uno + Wifi it has 8 switches on the board which control how communication flow between the MCU, USB and ESP.
Swith 5 and 6 connect USB serial input to the ESP.
Swithc 7 sets the ESP in flash mode.
So to flast the ESP you would set pins 5, 6 and 7 on ON.
Others on OFF.
You of course need to change the switches again to let the MCU communicat to the ESP.
There is a table on the AliExpress and Robotdyn sites for the module, which explains in what position each switch needs to be in for communication mode.
Don’t give up on the modules. They work very well once flashed with the standart AT-capable firmware.
Let us know how it goes.
BB