Questions about Devolo Magic 1 WiFi mini

Yes, you can

This has a higher potential Max. data transfer rate (1200 Mbit/s vs. 500 Mbit/s)

You would need one of these in the hallway (connected to your router) and one in the living room to make full use of its functionality. You want a Wi-Fi extender or similar instead, this isn’t that.

Yes, this works without any problems. It is described on the Devolo page in the compatibility section.

I have bought 3 Devolo Magic incl. Mini WFI and I always have interruptions in the WFI to the Swisscom Internet Box 2 when I move around the house. I have now bought the Swisscom Box 2 and deactivated the Devolo and now it works perfectly. So I can't really recommend Powerline Devolo. Whether old or magic.

By misleading, do you mean that the advertised 1200 Mbps cannot effectively be used? That's part marketing and part principle due to Powerline itself. Data transmission over normal power cables is usually one of the most stupid ways to transmit data. Since power cables are not designed to transmit data, especially not at the speeds required today, the difference between gross and net is getting bigger and bigger. https://de.wikipedia.org/wiki/Datendurchsatz Since all types of data transmission (Ethernet, Wlan, LTE, etc) specify the transmission types in gross, it is not misleading to advertise Powerline with the theoretical gross speed of 1200 Mbps. Another counter-example. How can it be that Swisscom advertises its Wlan Box 2 as being able to transmit 4800Mbps via Wlan? That is almost 5 times faster than via network cable. So why don't they just pull out all the cables and only do everything via wifi...? Swisscom WLAN-Box 2 (4800Mbit/s, 300Mbit/s)

I have unfortunately ordered the WiFi mini which is incompatible with all the others, to see. There is only the magic 2 which passes... well, I think so, considering the hell of the devolo which gives no information anywhere... Great 4 days to get it for telecommuting in confined spaces.... I'm angry at their false advertising that all and compatible my eye. I'm thinking of selling all my devolos and getting another brand.

No Magic is not backwards compatible.