Hi  @javier67 

According to the translation of Google Translate, I think that your question is RE450 LED is abnormal and it maybe have a hardware issue. If there is any discrepancy, please describe it in English.

Please try to factory reset the extender as below:

Keep the power on, use a pin to press and hold reset hole for 1 second to reset the extender

After that, please configure the extender again:

How to set up a TP-Link Range Extender

If the issue persists, please contact the local department for warranty consultation：

https://www.tp-link.com/support/contact-technical-support/#Hotline-Support

  @javier67 The problem is that I tried everything that appears in the manual, in your technical service and the repeater simply stopped working. I am an electronics expert, the device is no longer under warranty so I was checking and tried to communicate via ethernet and TTL and through RX-TX connection, the device is simply a brick. I am trying to rebuild the bios so I need a complete backup of the rom. Could you help me? I only need the binary file to load it directly to the integrated chip. I have already tried with the official firmware but it only contains files to update, they are not valid. I repeat: I would only need a dump or backup to start the stock device. (I use a programmer to save the data directly to the chip). Thanks.