windows update Feature update to Windows 10, version 2004 problem


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when I update Feature update to Windows 10, version 2004 on release preview I get error 'windows cannot be installed because this pc has an unsupported disk layout for uefi. then run into other problems.

I have dual boot release preview and fast ring on separate hard drive. now I tried to reset bios for UEFI error. then lost dual boot GUI boot loader. both drive lost mbr, cannot access.

I tried to use windows install disc, cmd, bootre /mbr, bootrec /fixboot, bootrec/rebuildbcd. still cannot boot into both installations, no GUI boot loarder


Then I used windows to go run same commands. the boot GUI built into the usb drive. I can go to bios find windows bootloader usb, it can go into both installation windows now. but when I unplug the usb. GUI bootloader disappear, cannot boot into both windows again.

how to solve those problems ?
 
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