Excuse me, Erik, I cannot find your e-mail (neither mine - where is it on the forum?) so I am obliged to answer you in the forum that looks silly.
I am in Quebec city, province of Quebec, Canada. I found the local sales office, that was in some other town not far from Montreal and I contacted them. After endless questions who? where from? project? annual estimate? they directed me to Toronto where their application engineer was supposed to be. He was never there, but each time I tried to contact him the usual chain of useless questions was started. Finally they advised me to look for support on their web site and here is the answer that I got (naturally, after answering once again all the possible questions on my personality):

Hi Michael,

We only give out programming specs for our flash devices to third party parallel programmer vendors. This is because the dataretention of the Flash is affected by the way it is programmed, if programmed incorrectly the parts might lose the data programmed
in the devices.

We do have some parts that can be programmed with ISP through the serial port with a free tool FlashMagic. These parts are the P89C51Rx2 and the P89C66x. The software can be downloaded from http://www.esacademy.com/software/flashmagic

Regards,

Bauke Siderius

The thing is that when Philips withdrew the programming protocols two or three years ago I already tried this way and failed, and that is since that that I avoid Philips' parts, it was just a mistake of my supplier and I don't want to punish him. But I thought that if you were speaking of it - probably the situation might be different? It was not different.
It is not U part - just P89C52BP.
So, once again you made me type a page of useless text.
My e-mail is mikhailpodgouzov@videotron.ca.

P.S. I am Russian by origin and I worked in the Soviet military reseach centers - never before I answered such an amount of personal questions as at Philips'. :-)
Regards,
M.