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If the keys are working correctly in UEFI, but not in Windows: The problem is likely with the software installed on the Surface, and you'll need to reinstall. See Creating and using a USB recovery drive for Surface.
Surface Pro 3 uses the 4th generation Intel® Core™ processor (i3, i5 or i7). Choose from one of the following:If your Surface isn’t listed above—for example, if you have an older product like Surface RT—that means .msi update files are not currently available for that device. We recommend connecting to Windows Update to update those Surface models. Here’s how: System software uses significant storage space. Available storage is subject to change based on system software updates and apps usage. 1 GB = 1 billion bytes. See Surface.com/storage for more details. If the LED lights turn on, your problem may be with Windows and not the device itself. The next step is to reset your Surface. Here's how: You'll also find a section about imaging for IT professionals. Prepare your Surface before updating
Note: If you're looking for Surface 3 features (instead of Surface Pro 3), see Surface 3 features. Diagram of Surface Pro 3 There are some solutions you can try. First steps if your Surface Type Cover or Keyboard doesn't work To update a Surface Pro 7 with build 19041 of Windows 10, choose SurfacePro7_Win10_19041_22.011.9935.0.msi. For Windows 11: Go to Settings > Accessibility > Keyboard (scroll down to the Interaction section). To adjust the settings, toggle the settings to either on or off, depending on your preferences. Note: If you don't see a Devices menu, then your device does not provide this functionality and is working as expected. Not all devices have this option on the UEFI screen.Having trouble with your Surface device keyboard, Surface Go Type Cover, Surface Pro Type Cover, or Surface Pro Keyboard? Select Start > Power > Shut down and wait a moment for your Surface to shut down. Then press and hold the power button for 20 seconds. If you see the logo screen appear after a few seconds, continue to hold for the full 20 seconds until you see the logo screen again. Charging port and 36-watt power supply. Attach the included power supply to the charging port when your battery is low. Learn more about Surface battery and power.