@JaderM Hi, what is the current firmware version of your TL-WR840N V6 and V6.8? and which firmware are you trying to update?

@Mik37-_ Hi, please follow this thread for troubleshooting: What can I do if my Router keeps Rebooting randomly? By the way, since it was working fine before, may I know if there is any change or...

@MariaDamon Hi, only the Internet LED is red, all the ther LEDs are off? are you still able to connect to it and login its web interface? If so, please share with us screenshot of Status page and...

@DannyRS Hi, did you try to reset the router and extender, then reconfigure them to see if it solves the problem? Currently, without the extender plugged in, the router could work fine and stable,...

@Jay-jaymercado Could you please let us know what kind of password do you mean? 1. If you mean the login password of your TP-Link device, it is recommended to try admin in lower case. However, if...

@SJGW Hi, may I know which unit is connected to your router via Ethernet cable? Based on the screenshot, the unit labeled C5C2 has no WiFi function and supports AV1300, it should be the TL-PA8010...