I have been trying to make my DVD player/writer Sony RDR-HX710 zone free by following the procedure indicated on the forum (https://www.videohelp.com/dvdhacks.php?select=Sony+RDR-HX710). To do so, I'm using the 1-for-all remote URC-3445, but I'm having some problems when programming buttons 1..5: the LED does not blink twice after entering 1891 to assign the code 189 to the button 1.
I've continued the procedure till the end even though the magic button did not flash, and naturally, TIMER OK is not displayed and the DVD player still does not accept region 1 DVDs.

Does anyone have any clue on how I can deal with this problem?
Thanks a lot!

orcac13@yahoo.fr