The article explains how to migrate settings from a GEN6 SonicWall to a GEN7 SonicWall without having the option of selecting 7.1.1-7047 or above in the target firmware list of the Migration Tool.
Please read about new SonicOS 7.1.1 release on this link. What’s New in SonicOS 7.1.1
If you have purchased new Gen7 device or are planning to migrate from your existing firewall to SonicWALL Gen7 firewall, the migration tool is available to assist with settings conversion. Â (please find the supported source firewalls, and more details for migration process here How to Create Gen 7 Settings File by Using the Online Migration Tool
NOTE: The Migration tool does not offer the 7.1.1-7047 or above firmware as a target firmware to migrate to. However, the converted settings using the target firmware as 7.0.1-5145 will be successfully imported. Â The steps below provide a path of importing the settings file. Â

TIP: For help with settings import, please follow: How to import settings on SonicWall ?