Let's Control It

I bought a relay that comes with ESP01 and I have successfully flash it with Espeasy. However, that relay does not accept commands from GPIO, they accept a series of HEX commands. The manual instruct me to use the original AT commands. I tried to flash it with AT command bins without success because the ESPeasy code is bigger than AT command bin and when I finished the flashing, the remaining ESPeasy code is continuing send status report and preventing me to send AT commands.

How do I remove Espeasy altogether from ESP8266?