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i have try all betas. I use imac15.1 or imacpro1.1.

I can install big sur on external usb disk(case) with no problem,but never on internal sata. My mb is gigabyte h97 d3h.No problem with catalina and same opencore. I use opencore 0.6.1 but i have the same problem with oldest. Every time halting there: