no help came back on with screen in landscape (Flipped ) mode and will not rotate unless I un check the auto rotate box and change it to Landscape mode in resolution settings myself
Fixed Held down volume up and power for 30 seconds wait 30 seconds and push both again for 10 seconds next power off like normal then restart and all is working as it should.
I just repaved my SP3, and still have the same issues as OP -- screen is flipped, keyboard is not recognized.
I thought it was somehow due to having attached an SP4 dock, but may that wasn't the issue.
Right now, my expensive tablet/laptop is a brick...
Update:
After shutting down and restarting, the screen is right-side up, but the keyboard still doesn't work.
Look in Device Manager and look to see if I2C or Accelerometer is showing an exclamation mark, if so uninstall the device and then scan for Hardware changes and allow the Surface to reinstall the device.
Old thread now I know but I've just been having accelerometer issues on an SP3 (i5 / 256gb model) after updating to version 1909 (Nov 19) and this process fixed it for me so thanks!!!