question for mac pro 2009 2010 model

[Uzumaki tech and servers]

So I recently bought a Mac Pro with Mojave installed on a 6 TB hard drive. Just happened to have a password on it, I went to install a new OS with a USB drive with 10 x all the way up Mojave but it wouldn't let me do it. 

 

I'm wondering if anybody has had this problem and what the solution is.

[da na]

Not quite sure what you are asking - do you want to put multiple installer images on a USB drive? 

Ventoy can do that with .ISO files, but the DMG packages used to install MacOS won't work; you'd need to obtain the ISOs (perhaps from archive.org) to put multiple installer images on one drive. It would also have to be formatted as Fat32 for the Mac to boot from it I believe.

The 2009 - there's a good chance it supports Internet Recovery so you could get the factory OS back on the machine that way too.

[LloydLynx]

18 hours ago, Uzumaki tech and servers said:

a USB drive with 10 x all the way up Mojave

If you could explain this part better, because it doesn't really make sense.

[Uzumaki tech and servers]

i bought a usb drive with clean install of 6 mac os software os x, Monterrey, el capaton, sierra, high sierra, and mohave