For a clean install on physical hardware, do not just burn the InstallESD.dmg to a USB. Use the Terminal command below to create a bootable drive correctly.
: 10.12.6 was the final stable release of the Sierra era. It resolved critical issues with SMB connections in Finder and improved the stability of the Terminal app. Hardware Bridge Mac Os Sierra 10.12.6 Dmg File Download
: Double-click the .dmg file to open it and view the InstallOS.pkg file inside. For a clean install on physical hardware, do
: This link downloads a file named InstallOS.dmg directly from Apple's servers. How to Install from the DMG It resolved critical issues with SMB connections in
If you see an error stating the installer is "damaged" or has an expired certificate, you can often bypass this by temporarily changing your system date in Terminal before starting the installation: Open from the Utilities menu. Type date 010514102017 and press Enter. Quit Terminal and attempt the installation again. How to download and install macOS - Apple Support (IN)