Nighthawk M6 Pro MR6500 Dropping internet

Proprietary charger? If you consider Qualcomms QR charger systems as proprietary: Yes, they all are, indeed.

Netgear does nowhere specify 9V/1.8A in any MR6550 documentation - that's your own or based on some wild Internet ideas. The point? Netgear have missed to provide exact specs of the power supply for many of these devices, stating the device requires a Quick Charge 2.0 (or higher), clearly do us all a great disservice.

Any QC 2.0 compliant power supply (adapter, converter, whatever) does provide the correct voltage and power - the user does not have to worry about. And no, without a device connected, doing the handshake between the power supply and the operating/charging device, only an USB standard default voltage might be available.

This is similar to IEEE PoE 802.3af, 802.3at, and 802.3bt Ethernet. With the difference that a a PoE PS does not apply power to the wires without any request from the powered device (PD) and successful negotiation - there is no risk killing Ethernet devices not designed for PoE (the most fear users coming to the community and asking for). Users don't need to know about the voltage and the power here either! However, systems listing voltages in some specs should be looked for carefully - these are typically proprietary, dumb, passive power devices.

Said this: I'm convinced also in the US one can find QC 2.0 or higher power adapters.

The standard? Yes, there is one in the USB standards! It's called USB Power Delivery (PD), and allows complaint devices to get up to 100W of power and more. 28V, 36V, and 48V fixed voltages - enabling 140W, 180W and 240W power to the powered device. The free USB-C cable might or might not be sufficient for carrying 5 Amps - for these purposes look for purpose built USB-C PD cables for 100 or for 240 Watts.

I won't talk on the sense (and nonsense) your favorite mobile provider does over there in the US - from what we see with customers (I don't talk of Netgear!) overseas it's just a mess, and Netgear suffers as much as other vendors, too. Yes you can upgrade and downgrade plans (in the sense of bandwidth available) on the fly, but you can't randomly change SLA, contract types, and more ....  JohnPeng knows exactly what I'm talking about ... so you do good and listen to what he is posting to the community. Yes, he mentioned of QC 2.0 earlier, too.

QC, PD, PoE are newer technology for many, a new world - difficult to understand that just voltage and amps alone are the right answer.

Regards,

-Kurt.