Suggest to set the different SSID on the extender wit the the router

good~

what's the model.no of your extender? How about the distance between the extender and your devices that cannot see the wifi network?

RE500 support access point mode

any settings has changed on the router? better check whether any MAC filtering or firewall on the router , the SSID and password on the router Reset the extender again, and use the web interface to...

Yes, it should overwrite normally. what's the format of your SD card, as far as I know, the camera only support FAT 32 If it did not replace the old video but stop recording, it may be caused by...