Asus Router Firmware Checker

Check for firmware updates on your schedule with no surprise auto-update disconnects mid-game.

A small Python CLI that logs into your ASUS router's web interface, asks ASUS servers if a newer firmware exists, and reports it alongside your current version.

Usage

pip install -r requirements.txt
python3 firmware.py

You'll be prompted for:

• Router IP - Enter for 192.168.50.1
• Username - Enter for admin
• Password - hidden input

Example output:

Current version: 3.0.0.6.102_40284-g167db18_1581-gca342_BB0B
Checking against ASUS servers...

A new firmware update is available: 3.0.0.6.102_40338-g47bdafb_1586-g1f414
Current version: 3.0.0.6.102_40284-g167db18_1581-gca342_BB0B

How it works

The script drives the router's web interface the same way the browser UI does:

1. Connect - opens Main_Login.asp over HTTP, falling back to HTTPS (self-signed certificates are accepted).
2. Log in - reads the failed-login state embedded in the login page. If the router is locked out it stops without trying, since every attempt counts toward the lockout. Otherwise it asks for a captcha if needed, then logs in through login_v2.cgi with a nonce-salted SHA-256 of the credentials, so the password is never sent.
3. Read the current version - from the firmver, buildno and extendno NVRAM variables.
4. Check for updates - triggers start_webs_update, then polls until webs_state_update says the check finished. webs_state_flag says whether an update is available and webs_state_info holds its version.

In firmware.py, Router wraps the HTTP calls, while log_in and check_asus_firmware_update hold the flow.

Notes

• Tested on RT-BE58U (firmware 3.0.0.6.x). The script has a marked spot where you can hook in notifications (Telegram bot, email, etc.).
• After 2 failed logins the router requires a captcha. The script opens the captcha image and asks you to type it. It never guesses, because each wrong answer counts as a failed login and 10 failures lock the router's web UI until a factory reset.