how to reinstall os on mac pro
I m not able to reinstall the MacOS on my macbook pro
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Had you attempted to use the above instructions? There shouldn't have been problems.
• How to re-install macOS - Apple Support
https://support.apple.com/en-us/HT204904
At what point was there an issue with using them? Maybe if the situation were told, an
answer could be explained. There are alternative install methods covered there too.
[By using macOS Recovery from the above reinstall page instructions, that could put
back whatever was on the drive. Unless Mac no longer has the Recovery partition.]
Another approach may be to Erase the drive (if you'd already had suitable backups)
and try to either re-install what had been there. Or, if the Mac could upgrade to later
macOS, try a stable version (if available) and download that version's Installer, here.
• How to get old versions of macOS - Apple Support
https://support.apple.com/en-us/HT211683