Hello @J0MBI ,

Welcome to our community.

Here are some additional troubleshooting steps you can try:

1. Try a different power socket: Ensure that the router is connected to a stable power source. Sometimes power fluctuations can cause boot

2. Try a different power adapter: If you have access to another compatible power adapter (or can borrow one), test with that to rule out power adapter failure.

3. Attempt a hard reset one more time: Use a pin to press and hold the reset button for at least 15-20 seconds while the router is powered on. Wait to see if all lights come up momentarily, which would indicate the reset is taking effect.

However, given that you've already tried extensive troubleshooting including TFTP recovery (which is typically a last-resort recovery method), and the router remains unresponsive to reset attempts, this strongly suggests either corrupted firmware that cannot be recovered through normal means, or a hardware failure. 

What's particularly worrying is that this device was purchased secondhand at an auction. If possible, I suggest you return the device as soon as possible.

Alternatively, It is recommended purchasing a brand new router with a full warranty service.