Ai-Thinker A9/A9G AT firmware documentation

This repository preserves historical documentation and release references for the Ai-Thinker A9/A9G AT firmware. It is a documentation repository: it does not contain the AT firmware source code or a build system.

Maintenance status: the latest published release in this repository is V1.6RC, published on 25 November 2017. Treat the material as a historical reference and verify current hardware, carrier, and regulatory requirements before deployment.

Start here

1. Identify the exact module model and hardware revision.
2. Read the current official A9 product specification and A9/A9G GPRS user manual.
3. Review the selected Ai-Thinker AT extensions. This file is not a complete modem AT-command reference.
4. Check the change history and obtain historical firmware assets from the GitHub Releases page.
5. After powering a module, use ATI to confirm the installed firmware version before applying version-specific instructions.

Documentation map

Resource	Purpose
Documentation entry	Recommended reading order and scope
Information architecture	Relationship between documents, releases, and external SDKs
Validation record	Reproducible checks and explicit validation limits
Selected AT extensions	Historical Ai-Thinker-specific command notes
Change history	Historical firmware changes
Feature notes (Chinese)	Historical feature notes and incomplete download placeholders
Hardware notes and FAQ (Chinese)	Power-supply and usage notes

AT firmware and on-chip development are different paths

• Use this repository and its Releases when operating A9/A9G with AT commands.
• For application development on the module SoC, use GPRS_C_SDK and its SDK documentation.

The SDK repositories do not replace the AT firmware documentation, and this repository cannot be used to rebuild the released AT firmware.

Network and hardware limitations

A9/A9G relies on 2G/GPRS service. Availability, SIM provisioning, supported frequency bands, and lawful use vary by country and carrier. Confirm them locally. Stable power and the correct hardware connection are required; consult the product documents before powering or flashing a module.

Repository validation

Run the offline documentation checks from Git Bash, WSL, or Linux:

bash scripts/validate-docs.sh

The check validates maintained navigation and historical evidence. It does not communicate with a modem, test a mobile network, or verify firmware binaries.