How to install macos using usb drive? Need help on this!

To install macOS from USB drive, the first step is to make a bootable USB. For modern macOS such as Sequoia, Sonoma, Ventura and Monterey, please borrow another Mac and use the createinstallmedia to create a bootable macOS installer.

Step 1: Open the App Store on your Mac. Search for the macOS version you wish to install (e.g., macOS Ventura). Click Download. The installer will be saved in the Applications folder once the download is complete.

Step 2: Insert the USB flash drive into your Mac. Open Disk Utility (found in Applications > Utilities). Select your USB drive from the sidebar.

Step 3: Click on Erase. Choose Mac OS Extended (Journaled) as the format and GUID Partition Map as the scheme. Name the drive (e.g., "MyVolume") and click Erase. 

Step 4: Open Terminal (found in Applications > Utilities). Enter the createinstallmedia command corresponding to your macOS version. For example, for macOS Ventura, the command typically looks like this:

sudo /Applications/Install\ macOS\ Ventura.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume

Step 5: Replace "MyVolume" with the name of your USB drive if different. Press Enter and type your administrator password when prompted. Confirm the action by typing Y when prompted to erase the USB drive. The process will take some time. Once completed, you’ll see a message indicating that the bootable installer has been created.

Step 6: Restart your Mac while holding down the Option (⌥) key. When the Startup Manager appears, select the USB drive named Install macOS [Version]. Click Continue and follow the on-screen instructions to install macOS from USB drive.

Note: Make sure your Mac is connected to a power source during the installation to prevent interruptions. Also verify that the macOS version you are installing is compatible with your Mac model.