Update your software. You should have the newest versions of your software installed before trying to upgrade to Windows 10 v2004.
Update your drivers.
Scan PC for malware. You can do a full system scan with Windows Defender or any third-party anti-virus tool.
Check hard drive for errors. If you discover faulty hard drives or that yours is filled with bad sectors, the best next step would be to buy a new one.
Make sure your hardware is still compatible. Replacing the faulty hardware component could solve the issue, if this is not the case, it is most likely the graphics card.
Use system restore. After the restore, the drivers need to be upgraded to the latest version. Then try to upgrade to Windows 10 v2004 again.
Reset your PC. If none of the above seemed to help, the only option left would be to execute a full-system reset. It is important to perform a back-up to ensure all of your data stays safe during this reset.
Bluetooth Issues with Realtek drivers
There have been difficulties with connecting to more than one Bluetooth device. Temporarily switch peripherals to non-wireless
Sleep issues with XPS 15 9570 laptops
Your device may randomly wake, draining the battery, and can even heat up in certain situations. Take precautions.
Compatibility issues with games
Troubles, such as only being able to chat in English, have presented. It is not clear yet as to whether Microsoft or the game developer will be responsible for resolving this issue.
Upgrade issues from Windows 7
Microsoft has addressed and solved this issue.
Windows 10 loses audio after update
Only certain Acer laptop models have been affected by this. No word has been released regarding this issue to date.
Processes lock up randomly
The only case where this has happened consistently is when someone tried to use Rufus to make a Windows 10 bootable flash drive from the Windows 10 2004 ISO.
“Fresh Start” feature has disappeared
It has simply been moved. Fresh start functionality has been moved to Reset this PC. To reset your PC, go to Start > Settings > Update & Security > Recovery > Reset this PC > Get Started. Then select Keep my files, choose cloud or local, change your settings, and set Restore preinstalled apps? to No. If you don’t see the option to Restore preinstalled apps, it means your PC doesn’t have preinstalled apps configured and won’t restore apps from your PC manufacturer.
Printer issues
KB4557957 update has caused some printers to stop working. Until Microsoft resolves this issue, the only way to get printing capabilities back is to uninstall KB4557957.
External display stops working
This only seems to affect external displays when you try to draw using an Office app. It can cause both monitors to flicker and the external display to go black. A temporary fix can be to restart the affected device.
