can't use working copy create by smartSVN2.07 wiht smartSVN6.0.1

Hi.
we will migrate all our projects (about 400)  from subversion 1.4 to 1.6 and SmartSVN2.07 to 6.0.1.

I'm using SmartSVN 2.0.7 at the moment and all my working copies are using  
Subversion 1.4.

we will switch to SmartSVN 6.0.1 But  these working copies  does not upgrade
automatically?.

How to upgrade these working copies from smartSVN2.0.7 to  smartSVN6.0.1.
Without a new checkout.

abdeliah(Renault)