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Bless Tool Problems

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Can't boot into other identical internal ssds or install big sur usb (patch).  Keep getting error that the bless tool cannot let me choose a different disk.  Have tried the fsck_msdos 0s1, then repair in disk utility - on this forum.  Didn't work.  Also running radeon rx580 on my mac pro 2012 3.46 Ghz 12-core, so no boot screen when holding down option key to reboot.  Any help will be appreciated.  This problem didn't occur until Mac OS Catalina.



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