Latest firmware number for Series X wireless controller?

Firmware version 517.3202.0 is the latest firmware version available for the Elite Series 2 controller. So your controller has the latest firmware available.

Don't forget the Elite Series controllers use a different firmware than the other controllers, because it has different features to the standard controllers.

Make sure you have the latest firmware for it.

Unfortunately, the series 2 does have issues, the bumpers being a bit iffy is one of them.

If you have no joy after updating the firmware try support here :- https://beta.support.xbox.com/help/hardware-network/controller/wireless-controller-solution

im on firmware 5.11.3118.0 for xboxc series S controller - latest, been on for weeks, before the problems with constantly disconnecting & reconnecting to the console after the latest console update about 2 weeks ago.

series S

OS10.0.22000.3055

Shell 2111.0.2112.11002

tried the controller firmware rollback via xbox assist, when you check the firmware it just says something went wrong - its on the latest firmware.......

In this case, it wouldn't be a bad idea to update your controller's firmware. You can do this on your Series X or your Windows 10 PC. To do it on the Series X, connect it using the USB cable and then go to Settings > Devices & connections > Accessories, and then select the controller you want to update. On the Xbox Wireless Controller screen, select “…” to check the firmware version for your controller. Then, select the Firmware version square, and then press Next to start the update process.

To do it on Windows 10, just download the Xbox Accessories app from the Microsoft Store. If you already have it installed, just run it. After opening the app, the procedure to update is the same one as on the Series X, press the "..." button and follow those steps.

Check if your controller works correctly after doing this.

Hi and thanks for reaching out. I hope you’re doing well. I'm an Independent Advisor and a Microsoft user like you and I'll be happy to help you.

Xbox wireless controllers, including the latest Xbox Wireless Controllers included with the Xbox Series X and Series S consoles, are compatible with the Xbox Series S. In addition, some older Xbox One wireless controllers work with the Xbox Series S. As for third-party wireless controllers, the compatibility depends on the specific controller and whether it is designed to work with the Xbox wireless protocol. The Ant eSports controller you mentioned appears to be a third-party controller designed for PC gaming, and it may not be compatible with the Xbox Series S.