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May 1, 2022 at 21:43 comment added David Anderson I do not know what caused the GUID to change. By default, High Sierra installs on SSDs to APFS volumes. APFS containers have the string NXSB stored at offset 0x20. I used hexdump to confirm the existence of NXSB, and therefore concluded the GUID in the GPT was wrong.
May 1, 2022 at 21:18 comment added Juan Pablo C It did solve the issue, what happened exactly for the guid to change and how did you realise it should be apfs?
May 1, 2022 at 21:17 vote accept Juan Pablo C
May 1, 2022 at 20:30 history answered David Anderson CC BY-SA 4.0