This is my first post on this forum, so don't be cruel, please

The matter is:
I bought non-working RDR-HX717 for few bucks, just to have some spare parts for my RDR-HX710. Unfortunately after getting the cover off I realized that it's quite different machine (philips inside?) and I couldn't use it as spare parts.
Anyway, after I have repaired my RDR-HX710 another way, I just checked what's going on with HX717.
The symptoms are: "STARTING" for several seconds. Then TV receives some kind of signal and display blank (black) screen. It do something like reset and everything repeates infinitely. It doesn't react on any key on main unit nor remote.
After reading some infos on this forum I tried to enter service mode and the observations are:
- when plugin power cord holding PLAY on main unit I see on display some (I suppose) diagnostic messages (no picture on TV). Until yesterday it finished with "FAIL 210002". Then I played a little bit with HDD jumper settings and finally got "PASS" after entering the diagnostic. I realized that someone had already played with HDD replacing it or at least changing jumper positions.
- when plugin power cord holding EJECT and REC on main unit it displays some messages related (I suspect) to firmware upgrade, something like 'DOWNLOAD", "FORCED DL", then ejects and asks for disc (I have no disc with firmware) and finally "ERROR DOWNL".
Anyway I think the problem is with HDD recognition. If somebody has changed the disk, recorder probably sees incompatibilities between disk ids (stored somewhere in non-volatile memory and new one from disk).
So questions to you are:
- is there any option to enter service menu and update disk id there? What is the procedure?
- I would appreciate if anybody is able to send service manual of this model to me.
- The same with firmware - as the last chance I would try to update the firmware (maybe it is crashed for some reason). If somebody has it...
/jayu