Look at the sticker on the bottom of your Tenda 4G630. Note the hardware version (e.g., V1.0 or V2.0). Firmware versions must match your hardware version exactly.
This guide provides the official resources, direct navigation paths, and safety steps needed to update your Tenda 4G630 firmware without risking a device malfunction. Official Tenda 4G630 Firmware Links tenda 4g630 firmware update link
This is the scariest sentence in consumer electronics. For exactly 90 seconds, the router sat there. The lights cycled: Power. System. 4G. They turned off, then flashed in a chaotic seizure of data rewriting. It was rewriting its own operating system, purging the bugs that had caused the disconnects, patching the security holes that left the network exposed. Look at the sticker on the bottom of your Tenda 4G630