Cause: The update reset the Wi-Fi channel to a country-specific band (e.g., Channel 13 which your laptop doesn't support). Fix: Hard reset the device: Remove battery, wait 30 seconds, reinsert battery. Press and hold the reset button (next to the USB port) for 10 seconds using a paperclip. Then reconfigure Wi-Fi SSID and password.
This is the safest method. Huawei's servers push the update directly to your device. Update Software in HUAWEI E5573CS-323
Procedure:
Why this fails often: Huawei stopped officially supporting many E5573 variants after 2021. Their update servers are sometimes offline. If you see "No updates available" but you know a newer version exists, move to Method 2. Cause: The update reset the Wi-Fi channel to
Cause: A failed OTA update. Fix: Use the SD Card Method (Method 3) with the exact same firmware version that was on the device before the crash. After it recovers, then update to the newer version. This is the safest method