firmware/variants/tlora_v2/variant.h

#undef GPS_RX_PIN
#undef GPS_TX_PIN
#define GPS_RX_PIN 36
#define GPS_TX_PIN 13 // per @eugene

#define BATTERY_PIN 35 // A battery voltage measurement pin, voltage divider connected here to measure battery voltage

#define I2C_SDA 21 // I2C pins for this board
#define I2C_SCL 22

#define VEXT_ENABLE 21 // active low, powers the oled display and the lora antenna boost
#define LED_PIN 25     // If defined we will blink this LED
#define BUTTON_PIN                                                                                                               \
    0 // If defined, this will be used for user button presses, if your board doesn't have a physical switch, you can wire one
      // between this pin and ground
#define BUTTON_NEED_PULLUP

#define USE_RF95
#define LORA_DIO0 26 // a No connect on the SX1262 module
#define LORA_RESET 14
#define LORA_DIO1 35 // Not really used
#define LORA_DIO2 34 // Not really used