Build 21390 included early code for a redesigned taskbar overflow system. While not fully active by default (requiring a feature ID hack), it previewed how Windows would handle too many icons – a feature that took two more years to fully mature.
Let me know and I'll do my best to help. windows 10 insider preview build 21390 x86 x64 iso incl
Set your BIOS date to May 2021 before installation. Install, then disable Windows Time service. Not recommended for daily use. Build 21390 included early code for a redesigned
Use an imaging utility such as Rufus to burn the inclusive ISO file onto a USB flash drive (minimum 8 GB capacity recommended for dual-architecture images). Set your BIOS date to May 2021 before installation
If you already have an earlier Windows 10 Insider build installed, you can upgrade by mounting the ISO and running setup.exe . Alternatively, Windows Update can deliver the cumulative updates (KB5004123, etc.) if available.