To anyone that can help me out.
Here's the situation!
I have a Tenda AC2100 a23 router that I tried to restore the config file, but I accidentally uploaded a config of my second router.
It then cut off my connection with the router shortly after. Now, the LED indicator for the is stuck on and the router stopped functioning.
I tried updating the firmware via TFTP 30 Second reset button method, it does write the firmware but it does'nt restores the config file which is the real issue.