Is it posible to upgrade from NewBB 2.2 to latest CBB and keep all posts?

From the release notes:

Quote:

It wouldn't hurt to backup your site files and database before performing this upgrade

Quote:
To test on a server before hand....which you can use wamp for, and it is far safer....then you know all like ABC when doing anything for real

I feel like I'm missing something here.
I've got about 3000 posts on my Newbb 2.02, XOOPS 2.0.16.
I put latest Frameworks in XOOPS root, added the XOOPS Editor, and overwrote the newbb files with the CBB 3.08 files. Go to system, modules, update the forum and all I get is a blank screen. Tried it on an empty database and it still doesn't quite work.

With debug on, I get
All errors (0) queries (6) blocks (0) extra (1) timers (3)
Errors
Queries
SELECT * FROM cheshx_config WHERE (conf_modid = '0' AND conf_catid = '1') ORDER BY conf_order ASC
SELECT sess_data FROM cheshx_session WHERE sess_id = '22106a54b632746af10dafd3307f9621'
SELECT * FROM cheshx_users WHERE uid=1
SELECT * FROM cheshx_modules WHERE dirname = 'system'
SELECT * FROM cheshx_modules WHERE dirname = 'newbb'
SELECT * FROM cheshx_newblocks WHERE mid=2
Total: 6 queries
Blocks
Total: 0 blocks
Extra
Token Validation: Valid token found
Timers
XOOPS took 1.008 seconds to load.
XOOPS Boot took 0.193 seconds to load.
Module init took 0.814 seconds to load.

Nothing else. Anyone overcome this?