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HP Z2 SFF G9 Workstation Desktop PC (4N3T7AV)

hi,

 

ill try to downgrade my pc (win 11 to win ltsc 2021) installation go well but when starst first time pc tells "we culdnt installa windows 10 0x800f0830-0x20003 installalation failed in the SAFE_OS, phase whit an error INSTALL_UPDATES operation

What next?

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