<!--
---
title: "Factory Reset"
id: "tool_factory_reset"
kind: "page"
project: "TinyGSM"
version: "0.13.0"
source_file: "extras/tools/FactoryReset/ReadMe.md"
generated_at: "2026-10-27"
---
-->

# Factory Reset

This sketch resets the modem to factory defaults.

---

## The Complete Code

```cpp
/** ============================================================================
 * @example{lineno} FactoryReset.ino
 *
 * @brief This sketch resets the modem to factory defaults.
 *
 * To run this tool you need the StreamDebugger library:
 *   https://github.com/vshymanskyy/StreamDebugger
 *   or from http://librarymanager/all#StreamDebugger
 * ========================================================================== */

// Select your modem:
// #define TINY_GSM_MODEM_SIM800
// #define TINY_GSM_MODEM_SIM808
// #define TINY_GSM_MODEM_SIM868
// #define TINY_GSM_MODEM_SIM900
// #define TINY_GSM_MODEM_SIM7000
// #define TINY_GSM_MODEM_SIM7000SSL
// #define TINY_GSM_MODEM_SIM7080
// #define TINY_GSM_MODEM_SIM5360
// #define TINY_GSM_MODEM_SIM7600
// #define TINY_GSM_MODEM_A7672X
// #define TINY_GSM_MODEM_UBLOX
// #define TINY_GSM_MODEM_SARAR4
// #define TINY_GSM_MODEM_SARAR5
// #define TINY_GSM_MODEM_M95
// #define TINY_GSM_MODEM_BG95
// #define TINY_GSM_MODEM_BG96
// #define TINY_GSM_MODEM_A6
// #define TINY_GSM_MODEM_A7
// #define TINY_GSM_MODEM_M590
// #define TINY_GSM_MODEM_MC60
// #define TINY_GSM_MODEM_MC60E
// #define TINY_GSM_MODEM_ESP8266
// #define TINY_GSM_MODEM_ESP32
// #define TINY_GSM_MODEM_XBEE
// #define TINY_GSM_MODEM_SEQUANS_MONARCH

#include <TinyGsmClient.h>

#if (defined(ARDUINO_NRF52840_FEATHER)) && !defined(ADAFRUIT_TINYUSB_H_)
#include <Adafruit_TinyUSB.h>  // for Serial
#endif

// Set serial for debug console (to the Serial Monitor)
#define SerialMon Serial

// Set serial for AT commands (to the module)
// Use Hardware Serial on Mega, Leonardo, Micro
#if !defined(__AVR_ATmega328P__) && !defined(SerialAT)
#define SerialAT Serial1

// or Software Serial on Uno, Nano
#elif !defined(SerialAT)
#include <SoftwareSerial.h>
SoftwareSerial SerialAT(2, 3);  // RX, TX
#endif

#include <StreamDebugger.h>
StreamDebugger debugger(SerialAT, SerialMon);
TinyGsm        modem(debugger);

void setup() {
  // Set console baud rate
  SerialMon.begin(115200);
  delay(10);

  // Set GSM module baud rate
  SerialAT.begin(9600);
  delay(6000);

  if (!modem.init()) {
    SerialMon.println(
        F("***********************************************************"));
    SerialMon.println(F(" Cannot initialize modem!"));
    SerialMon.println(
        +F("   Use the extras/tools/AT_Debug sketch in the TinyGSM library "
           "folder to find correct configuration"));
    SerialMon.println(
        F("***********************************************************"));
    return;
  }

  bool ret = modem.factoryDefault();

  SerialMon.println(
      F("***********************************************************"));
  SerialMon.print(F(" Return settings to Factory Defaults: "));
  SerialMon.println((ret) ? F("OK") : F("FAIL"));
  SerialMon.println(
      F("***********************************************************"));
}

void loop() {}
```

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