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<blockquote data-quote="Rod" data-source="post: 1950492" data-attributes="member: 204485">Great, thanks for the feedback.&nbsp; There is something about &quot;certificates&quot; that I don't understand, it's no longer an issue for me but back when it was I used to occasionally run into an issue where the certificate had expired for the macOS installer.&nbsp; I know that Apple changed something about that but as stated because I'm always up to date with the latest macOS now I no longer run into that problem.So, what I'm getting at is, perhaps you cannot use the same USB installer repeatedly on multiple devices which is stupid because that &quot;used to be&quot; the whole point.&nbsp; &quot;Used to be&quot; being the key point.Anyway if you prefer the USB Flash device upgrade method by all means use that, I personally did not like the Terminal process so I used the 3rd party InstalDisk Creator free from MacDaddy.io[ATTACH=full]40251[/ATTACH]This creates a bootable macOS installer on your chosen USB Flash drive (it will erase it first) it never failed for me and it provides instructions along the way as well as a progress bar which Terminal lacks.Have you tried downloading Catalina from the sites I attached?&nbsp; The second one is the one I've used most successfully.Do let us know how you get on.<img class="smilie smilie--emoji" loading="lazy" alt="🙏" title="Folded hands&nbsp; &nbsp; :pray:" src="https://cdn.jsdelivr.net/joypixels/assets/6.5/png/unicode/64/1f64f.png" data-shortname=":pray:" /><img class="smilie smilie--emoji" loading="lazy" alt="👍🏼" title="Thumbs up: medium-light skin tone&nbsp; &nbsp; :thumbsup_tone2:" src="https://cdn.jsdelivr.net/joypixels/assets/6.5/png/unicode/64/1f44d-1f3fc.png" data-shortname=":thumbsup_tone2:" />PS. It is possible that your flash drive is failing.</blockquote>

[QUOTE="Rod, post: 1950492, member: 204485"] Great, thanks for the feedback. There is something about "certificates" that I don't understand, it's no longer an issue for me but back when it was I used to occasionally run into an issue where the certificate had expired for the macOS installer. I know that Apple changed something about that but as stated because I'm always up to date with the latest macOS now I no longer run into that problem. So, what I'm getting at is, perhaps you cannot use the same USB installer repeatedly on multiple devices which is stupid because that "used to be" the whole point. "Used to be" being the key point. Anyway if you prefer the USB Flash device upgrade method by all means use that, I personally did not like the Terminal process so I used the 3rd party InstalDisk Creator free from MacDaddy.io [ATTACH type="full" alt="Screenshot 2025-04-13 at 10.35.25.png"]40251[/ATTACH] This creates a bootable macOS installer on your chosen USB Flash drive (it will erase it first) it never failed for me and it provides instructions along the way as well as a progress bar which Terminal lacks. Have you tried downloading Catalina from the sites I attached? The second one is the one I've used most successfully. Do let us know how you get on.🙏👍🏼 PS. It is possible that your flash drive is failing. [/QUOTE]

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