Which on the front panel?
If a firmware update fails or the router becomes unresponsive (e.g., the SYS light blinks or stays solid): tenda v300 firmware fix
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Use a paperclip to press and hold the tiny button on the back panel. While holding the Reset button, power the router back on. If you share with third parties, their policies apply
If a previous upgrade failed and your router is completely unresponsive (e.g., only the power light stays on, or it is stuck in a boot loop), you may need to use a TFTP boot recovery or the CFE recovery mode to force-flash the firmware. Accessing the CFE Web Emergency Recovery Mode
If the official site is down, contact Tenda support directly: support@tenda.com.cn
The router powers on, all lights flash, it restarts, and repeats this cycle indefinitely.