Qi Charger not working since IOS 12.1 Update

The iPhone 7 has never accepted a Qi charger. You need an iPhone 8 or later to accept wireless charging.

How to wirelessly charge your iPhone 8 or later - Apple Support

Hardware fails at unpredictable times.

So it sounds like your scenario is something like this:

• Your wireless Qi charger was working fine. Yesterday, it started to fail.
• Yesterday, you happened to update your iPhone 7 (which you know does not use the Qi charger) to iOS 12.1.

These events must be unrelated.

Perhaps something else happened yesterday for the first time - perhaps a bulb blew out in your living room for example, That would also be unrelated to the Qi charger's failure.

Thank you for that additional information. I used that information to do a search of their devices. When I look at their specifications, etc., I do not see where they are MFi certified devices. Since this device failed when you updated to iOS 12, I suggest you contact their support to see what they have to say. It could very well be that since they do not advertise as MFi certified, the devices will not work with the latest iOS, but they should be able to answer that question for you. Good luck.

I have no idea how it would have worked in the past, since the iPhone 7 did not support wireless charging. Are you sure this is an iPhone 7? If so, then wireless charging not working is normal.

Mine works just fine. Running 12.1 on iPhone X 12.1 actually sped up quick charge a little

It would have helped if you shared that in the beginning. Who is the manufacturer of the case?