"I am in trouble to understand the reason of your defamatory words."

Consider the following defamatory remarks:

"I conclude that I cannot read from code space with 89c55wd."
Bahri Okuroglu, 10-07-03 15:02

"89C55WD is not working properly"
"this msg has`t got much attention"
"I had given up using 55WD"
Rustu Kaya, 10-08-03 09:00

These are serious allegations and should be backed up.

you've been asked a direct question: does the datasheet description of the lock bits explain the behaviour you're worried about?

You should be able to answer that by simply looking at the datasheets and your memory map - NO need for any hardware!

"The discussion has turned out to be a compatibility problem"

Your answer to the Lock Bits question should confirm this, then.