Both with Secure Boot disabled, or not existing in laptop case.
1st System Minisforum miniPC Ryzen 9 7940HS (32GB RAM + NVMe disk + W11 26H2): KRD2026beta started normally and fast. Got also KSN error not available.
2st System: old HP laptop Intel T4300 (8GB RAM + SSD SATA disk + W10 IoT Enterprise LTSC 22H2): got stuck in GRUB screen...