Hello. Can anyone to give me a good advice. I have iMac with High Sierra and I want to setup modern OS like Sonoma or Sequoia.
I chaged AMD HD9XXX to NVidia K2100 and this works good in High Sierra, but I can't update macOS.
All my attempts crashed with "...update failed" or "...installer corrupted" at 12/13th minute. I tried to use different USB-drives, tried to setup directly from separate SSD partition, reset PRAM, and another target SSD I used too. :)
I've already tried Monterey, Sonoma and Sequoia and now I don't know what do I do more.
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