[Users] Can't import VM from 3.0 engine

[ovirt at qip.ru]

After reinstallation of engine from build #369 to #440 (clean install), I attached NFS export domain to new DC (compatibility 3.0), but on page "VM Import" there were only VMs that I saved with 3.1 engine. 

Messages in webadmin event : 

Failed to read VM 'VM01' OVF, it may be corrupted 
Failed to read VM 'VM02' OVF, it may be corrupted 
Failed to read VM 'VM03' OVF, it may be corrupted 

There are no error's messages in engine.log
When I tried to edit OVF for VM01 by xml editor, I've got

Failed to read VM '[Unknown name]' OVF, it may be corrupted
Failed to read VM 'VM02' OVF, it may be corrupted 

Failed to read VM 'VM03' OVF, it may be corrupted

How is it possible to convert from ovf:version "0.9", to ovf:version "3.1.0.0" or correct OVF files ?

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