QA_Toggle won't work

History:
NAND PS3: used ProgSkeet read NAND, patch, verify, and re-programmed to get PS3 successfully on to Rogero.

Problem though: BlueRay DVD is not original, hence needs remarrying via downgrade & remarry process etc.

So, successfully downgraded to 3.55 OFW.

Then installed Rebug QA_Toggle package to de-hash. Package installed OK and appears under Games XMB.

Now the problem: Running QA_Toggle, screen goes black (good) and then NOTHING. No beeb, no return to XMB. Tried this many times.

Any advice will of course be much appreciated!

Andy