In case you have not heard, you should stop using SMB1. Not only is it 30 years old and was publicly deprecated back in 2014, it was also superseded by SMBv2 all the way back in 2007. In Windows 10, version 1709 (Fall Creators Update) and Windows Server, version 1709 (RS3), the Server Message Block version 1 (SMBv1) network protocol is no longer installed by default. The full removal has begun.
There is a caveat: while there are few valid use cases left in modern enterprises where SMB1 is still required, you may still be running a product that explicitly requires SMBv1. In my personal experience, an attempt to get rid of an outdated product, may hit a snag and the conversation with the CEO may go like this:
Security Officer: "Microsoft removed SMBv1 in the latest edition of Windows 10 because it is an older protocol and it has known security issues regarding ransomware and other malware."
CEO: "Is it possible to reinstall it?"
Security Officer: "Yes, but Microsoft strongly recommends that we do not reinstall it as SMBv1 was the main attack vector for the recent WannaCry outbreak."
CEO: "You do know I am the CEO, right?"
Case and point, SMBv1 is bad, really bad and you should never, ever reinstall it. But - if this is your only option - it is very easy to enable SMB1 in your environment during OSD. Simply add an Install Roles and Features step in your task sequence and select SMB 1.0/CIFS File Sharing Support feature.
Alternatively, run this simple PowerShell script:
# Determine where to do the logging
$tsenv = New-Object -COMObject Microsoft.SMS.TSEnvironment
$logPath = $tsenv.Value("LogPath")
$logFile = "$logPath\$($myInvocation.MyCommand).log"
# Start the logging
Write-Host "Logging to $logFile"
# Start Main Code Here
Write-Host "Enabling SMB1 optional feature."
Enable-WindowsOptionalFeature -Online -FeatureName smb1protocol -NoRestart
# Stop logging