Unable to first login after Sequoia update

I was on last Sonoma version with OCLP 2.4.0 in my iMac 16,2. I have updated to Sequoia 15.6 but I can’t make my first login. Start screen appears but after one second it turns to black, so I don’t have time enough to write my password. It repeats constantly as a loop.

Any help? Thanks in advance

submitted by /u/chocula81
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