@zexoni70 Not sure, but at least they are different devices with different FW. Moreover TL-WA901ND is a dedicated AP, while the wireless router in AP mode is a wireless router with reduced features.

@RM17 These are the FW releases for your device. TP-Link recommends installing the latest one. If you don't have any issues using the device, there's no need to do that, unless you need to have some...

@HP15z Use this guide to find your A7's IP address. Make sure that, when you walk through these steps, you're connected to A7 via wireless.

@zexoni70 With your current HW it wouldn't solve that problem. Check these FAQs regarding OneMesh feature, in particular from Q7 to Q10.

Can't say, because I don't know the algorithm of the soft one, that's why I recommend the hard one.

@HP15z Why don't you try to hard reset (Method 1) the device and re-configure it from scratch to see if that will restore previous state (before enabling guest networks).