If xHP Flashtool for Windows crashes on startup (right after the splash screen), you can try installing the following tools and runtimes, which are required to run xHP Flashtool but may be missing from your Windows installation. Please install the tools/runtimes one by one and check if xHP Flashtool starts correctly.
.NET Native Repair Tool
https://xhpflashtool.s3-eu-west-1.amazonaws.com/NetFxRepairTool.exe
Microsoft.NET.Native.Runtime.2.2.appx
https://xhpflashtool.s3-eu-west-1.amazonaws.com/Microsoft.NET.Native.Runtime.2.2.appx
Microsoft.NET.Native.Framework.2.2.appx
https://xhpflashtool.s3-eu-west-1.amazonaws.com/Microsoft.NET.Native.Framework.2.2.appx
Microsoft.UI.Xaml.2.4.appx
https://xhpflashtool.s3-eu-west-1.amazonaws.com/Microsoft.UI.Xaml.2.4.appx
Microsoft.UI.Xaml.2.5.appx
https://xhpflashtool.s3-eu-west-1.amazonaws.com/Microsoft.UI.Xaml.2.5.appx
Microsoft.VCLibs.x86.14.00.appx
https://xhpflashtool.s3-eu-west-1.amazonaws.com/Microsoft.VCLibs.x86.14.00.appx
Get this File installed
https://aka.ms/vs/17/release/vc_redist.x86.exe