Windows 10 Win10 1903 (or 1909) upgrade - Realtek Bluetooth problem

I was able to find a solution on the internet.
In my situation I had to remove the old Realtek Bluetooth driver named: RtkBtfilter.sys (C: \ Windows \ System32 \ drivers folder). After deleting the file, the update went without a problem.
Here I found a solution:

Once tried these methods. Might be these can help you

• https://support.lenovo.com/us/en/solutions/ht506380
• How To Update Realtek Bluetooth Driver - Windows 11,10
• Troubleshoot problems updating Windows - Microsoft Support

Great set of suggestions, thanks for sharing these links! The Lenovo support page often has device-specific instructions that have helped many users tackle Realtek Bluetooth issues, especially when moving between Windows 10 builds like 1903 and 1909. The guide on updating the Realtek Bluetooth driver from Systweak provides a clear step-by-step process that can be very handy if the standard driver update through Windows Update or Device Manager hasn't done the trick. And of course, the Microsoft troubleshooting page is an excellent resource for working through any hiccups that might arise during Windows updates.
Sometimes after a major Windows update, it's a good idea to completely uninstall the problematic driver from Device Manager and then reinstall it using the latest version downloaded from the manufacturer’s site. If you're using a Lenovo device, using their tailored solutions as provided in the Lenovo support page can ensure you’re matching the correct driver to your hardware.
Your list offers a great variety of approaches, so hopefully one of them will work for those still facing the issue. Thanks again for helping the community out with these fast troubleshooting methods. Has anyone else tried these steps, or perhaps discovered an alternative solution? Let’s keep the conversation going!