@Chu-R Here's <https>://wifirepeater.org/tp-link-tl-wr840n-repeater-mode/ a guide on how to configure WR840N in a range extender mode. Use a web browser for configuring WR840N. You have to know the...

@Naomi14 I would try to reset the modem again while holding the reset button for 10 seconds to see if any difference. If that doesn't help replacing the modem at the retailer would be your last...

@BigCatXJS Yes, that's correct if you have a comprehensive device configuration and you have its backup.

@shevek There's no mesh capable TP-Link wireless router that is compatible with Deco mesh - these are different technologies - details.

@Simon771 These error messages look like a Windows driver issue. Uninstall all previously installed drivers, reboot the PC and install the latest one manually (for Win11x64) - here.

@Naomi14 Archer VR1210v seems to be a wireless modem router that is provided by your ISP. If your ISP provided the device you should contact the ISP and ask for help on this issue. Can you share a...