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sudo nvram "recovery-boot-mode=unused"
nvram: Error setting variable: - "recovery-boot-mode": (iokit/common) not permitted.
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cmd+r
Thank you.
p.s I cannot link URLs and images because I'm a new user here. I'll update the topic as soon as possible.
Note that I have the iso from where I installed the operating system. I thought retrying to boot from a live cd would be the solution but I was not able to perform this attempt and I got only a primitive shell where I'm able to do nothing from there.