There was a licensed component in a V2 phone that is not used in V3. This means V3->V2 downgrade is blocked for a phone which was originally supplied as V3, because if it wasn't, there would be a license contravention . The phone can go V2->V3->V2 (license originally paid for) but it can't go V3->V2 (license never paid for as not required).
Edit - just noticed you are actually going HFA-SIP not HFA-HFA so this restriction likely doesn’t apply…… I’ll leave the post there anyway.
I down grade as below
Phone me with software HFA V3 R0.40.0 not working in Hipath 4000 V6.0
Down graded to SIP with SIP V2 R2.48.0 (This image was downloaded from Tonido and not available in Unify partner portal)
Then down grade to HFA V2 R1.5.2
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