Surface Pro 4 type cover suddenly not working.

I found the below solution and tested successfully:

https://blogs.blackmarble.co.uk/adawson/2019/06/07/surface-pro-3-type-cover-not-working-after-windows-10-1903-image-applied/

My specific scenario:

-mdt server with both 1803 and 1903 images with latest updates applied

-imaging a previously working surface with either of these nukes the typecover

-following the above guide restored access with no reboot required.

I'm going to clear out all surface drivers from my mdt deployment and push only the latest to see if it fixes the root issue.

Update on the SP4 I've been supporting:

After updating to 1903 and pulling down all available updates (incl. drivers, etc,) there was no change to the device- keyboard still didn't work*.

After ~24 hours of being power on and off through normal use, the keyboard was mysteriously properly detected and began working normally.  I believe a firmware update became available after the initial course of updates that come down after installing 1903, but I don't have the device in front of me. 

To me, this substantiates a firmware level defect.  Of course, by this point, the device's owner has purchase a Dell Latitude 2-in-1.  :-\  Ah well, my faith in MS hardware is shot and I couldn't call the device "reliable" at this point.  The battery will probably start swelling any day now, anyway.

*Didn't Work meaning lit up, but was not properly detected in the Device Manager.  I.E.. the whole point of this thread.

Good news, there is no battery swelling issue. Issue is with the firmware which doesnt recognize the type cover. Before it completely stopped recognizing they keyboard, mine worked for few days on and off and then I think the firmware root files were completely corrupted. There need to be an update to fix files at root level, which never happened.

Last week, I was running creators update and for a second it recognized the device, but immediately with few auto refresh in device manager, HID keyboard was back and type cover was out of luck. Drivers on this laptop are crazy, for eg. there are 3 display drivers -one by MS, One by surface and one by Intel (you can see them under display drivers) and dont know which of these take the dominance. There are 6 vendor defined device drivers auto loaded, but there isnt anything connected (if you uninstall and scan for changes, these load again, like there are connected devices).

Update on the SP4 I've been supporting:

After updating to 1903 and pulling down all available updates (incl. drivers, etc,) there was no change to the device- keyboard still didn't work*.

After ~24 hours of being power on and off through normal use, the keyboard was mysteriously properly detected and began working normally.  I believe a firmware update became available after the initial course of updates that come down after installing 1903, but I don't have the device in front of me. 

To me, this substantiates a firmware level defect.  Of course, by this point, the device's owner has purchase a Dell Latitude 2-in-1.  :-\  Ah well, my faith in MS hardware is shot and I couldn't call the device "reliable" at this point.  The battery will probably start swelling any day now, anyway.

*Didn't Work meaning lit up, but was not properly detected in the Device Manager.  I.E.. the whole point of this thread.

I had the same issue with my surface type cover keyboard.

I was very disappointed because yesterday my surface fell to the ground and I thought that I should buy a new keyboard but the Two Button Shutdown method explained here: Keyboard Problems with Surface Tablets, worked for me. Important note is that you should hold the buttons at least 15 seconds until the UEFI screen appears.

Needless to say I had just updated Windows and I think this was causing the problem, not dropping my surface.

I hope this method works for everyone that have the same issue.

I HAVE A WORKING SOLUTION !

After one morning when I woke up and there was no power going to my typecover, not working even in BIOS. I did all the things that were suggested in the forums. I put the typecover in the fridge, uninstall and install drivers, update and firmware and nothing worked (as it was stated in the forums, but I had to try).

I remember that when I lost all the functionality and power to my typecover the Surfave Pro 4 battery was drained to zero. In some forums people suggested that the problem might be caused by the battery. 

Those are the following steps I made to fix my typecover problem :

1 - Unplugged the typecover and uninstall its drivers from "Device Manager"

2 - Install Battery Eater (http://batteryeater.com/) and run it until the battery dies.

3 - Leave the SP4 for 24 hours without any power.

4 - Put back the typecover and the charger to the drained SP4.

5 - Press the Power****VOILÀ

This proves that patience and fasting solves any problem. Have a great reunion with you loved typecovers ! 

Does not work unfortunately. Microsoft continues to ignore the issue.