Hi @gold1125 ,

For firmware updates, we currently only have two methods: online update and manual update. We do not recommend you to try other unconventional update methods. Hardware problems caused by other unconventional update methods are not covered by the warranty service.

You can download the firmware from the official website of en: https://www.tp-link.com/en/support/download/tl-wr840n/v5/#Firmware

Instructions for updating the firmware are as follows: How to upgrade the firmware of my range extender