Hi sandsfish, welcome to the community!
From what you describe it sounds like you do in fact have a V1.1 TBeam, if it has the 18650 holder, three buttons, LoRa and the GPS.
If I remember correctly there isn’t a special programming sequence or button. Do you have the ESP32 loaded in the Arduino IDE board manager? From there you will need to ensure you have the board TBeam selected. This post may help. "No Sats" status on Oled