One other clarification please: the post’s title suggests the upgrade will be to 9.2.5, but in the description, you reference 9.5.2 once. To confirm, are you asking about an upgrade to 9.2.5 or 9.5.2?
You can upgrade 9.0.787 directly to 9.2.5, but if you’d like to upgrade to 9.5.2, then you’ll first have to upgrade to 9.2.3.
If you haven’t already seen it, I’d highly recommend reviewing the BigFix Server Upgrade Best Practices:
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/Tivoli%20Endpoint%20Manager/page/Upgrading%20Best%20Practices
The following post might also be useful: