Results of my testing on E38.
Not sure what happened but landed up with one "bricked" e38, that irrespective of settings or V7.5 / V8 fails with $0322
Results of the 2nd E38
Content security settings have no effect on V7.5, V8 or HPT, all can read and write.
Setting autolock on with reflash security set to CF or FF works as designed for reading with V7.5, V8 and HPT - all fail
Wrting only works with V8, V7.5 and HPT fail