Released Firmware

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It is recommended to use the lastest version of firmware. Currently, Espressif releases AT firmware for the following ESP32-C2 series of modules.

Note

• The released AT firmware only supports chip versions with a crystal oscillator frequency of 26 MHz. If your module uses a crystal oscillator frequency of 40 MHz, you can compile the ESP-AT project by following the steps in Compile ESP-AT Project Locally documentation. In the project configuration during the fifth step, make the following selections:

  • Component config -> Hardware Settings -> Main XTAL Config -> Main XTAL frequency -> 40 MHz

• If you are unsure which AT firmware your module should use, please read the ESP-AT Firmware Differences document first. This document compares the differences among different ESP32-C2 AT firmwares in terms of supported command sets, hardware configurations, and module compatibility, helping you determine if there is a suitable firmware for your module’s hardware configuration.

• If you need to modify the following configurations, you can generate a new firmware by modifying the AT firmware using the at.py Tool.

  • Modify UART Configuration

  • Modify Wi-Fi Configuration

  • Modify Certificate and Key Configuration

  • Modify GATTS Configuration

Disclaimer

Before using the AT firmware below, please read the Disclaimer carefully and comply with its terms and precautions.

ESP32-C2-2MB-G2 Series

Note

• This series is no longer releasing new AT firmware. It is recommended to use the compatible ESP32-C2-2MB series instead.

The firmware version below is compatible with ESP32-C2 chip series ECO4 (Rev v2.0) only.

• v3.3.1.0 ESP32-C2-2MB-G2-AT-V3.3.1.0.zip

ESP32-C2-4MB-G2 Series

The firmware versions below are compatible with ESP32-C2 chip series ECO4 (Rev v2.0) only.

• v4.1.1.0 ESP32-C2-4MB-G2-AT-V4.1.1.0.zip (Recommended)

• v4.1.0.0 ESP32-C2-4MB-G2-AT-V4.1.0.0.zip

• v3.3.1.0 ESP32-C2-4MB-G2-AT-V3.3.1.0.zip

ESP32-C2-2MB Series

The firmware versions below are compatible with ESP32-C2 chip series from ECO1 (Rev v1.0) to ECO4 (Rev v2.0), inclusive of both ECO1 and ECO4 variants.

• v4.1.1.0 ESP32-C2-2MB-AT-V4.1.1.0.zip (Recommended)

• v4.1.0.0 ESP32-C2-2MB-AT-V4.1.0.0.zip

The firmware versions below are compatible with ESP32-C2 chip series ECO1 (Rev v1.0) and ECO2 (Rev v1.1) only.

• v3.3.0.0 ESP32-C2-2MB-AT-V3.3.0.0.zip

• v3.1.0.0 ESP32-C2-2MB-AT-V3.1.0.0.zip

• v3.0.0.0 ESP32-C2-2MB-AT-V3.0.0.0.zip

ESP32-C2-4MB Series

Note

• If your hardware is ECO4 (Rev v2.0) chip series, it is recommended to use the ESP32-C2-4MB-G2 series instead.

The firmware versions below are compatible with ESP32-C2 chip series from ECO1 (Rev v1.0) to ECO4 (Rev v2.0), inclusive of both ECO1 and ECO4 variants.

• v4.1.1.0 ESP32-C2-4MB-AT-V4.1.1.0.zip (Recommended)

• v4.1.0.0 ESP32-C2-4MB-AT-V4.1.0.0.zip

The firmware versions below are compatible with ESP32-C2 chip series ECO1 (Rev v1.0) and ECO2 (Rev v1.1) only.

• v3.3.0.0 ESP32-C2-4MB-AT-V3.3.0.0.zip

• v3.1.0.0 ESP32-C2-4MB-AT-V3.1.0.0.zip

• v3.0.0.0 ESP32-C2-4MB-AT-V3.0.0.0.zip

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