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Yes, but not always. You can repeat the same process with an older .bin file. However, Tenda sometimes prevents downgrades for security reasons. Check online communities for your specific version. tenda fh456 firmware update top
If the router acts strangely after an update, perform a factory reset by holding the Reset button for 10 seconds, then reconfigure your settings. To help you further, Explain how to back up your settings before the update? Help you secure your Wi-Fi password after the reboot? : Yes, but not always