Hi @khaled.mohamed ,
The first supported PAN-OS for the 3400 series is PAN-OS 10.2, so PAN-OS 10.1.x is a no go.
Looking at the software release guidance page PAN-OS 10.2.9-h1, 11.0.4-h2 and 11.1.2-h3 are preferred releases.
Depending on the features you're planning on using you might prefer one over the other.
The following pages will help you make your choice:
PAN-OS Software Release Guidance
Release Notes
PAN-OS New Features Guide
Upgrade/Downgrade Considerations
Palo Alto Networks Compatibility Matrix
Kind regards,
-Kim.
LIVEcommunity team member, CISSP
Cheers,
Kiwi
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