First of all: I succesfully upgraded my 411s with MK4, thanks to Z.
But I was a painful process, because of wrong or missing steps in the procedure.
I did everything as it was written in the nfo that came with the patch I got at speedlabs. After rebooting I tried my first burn with DvdDecrypter an it failed after leadin(Ritek G04-R). So I decided to reboot again and try a simulation with Nero before writing ather coasters.
But right after windows logon the damn blu screen appeared with unrecoverable error relating cdr4_2k.sys.
It took me a couple of hours to get in the position of reflashing my drive, this time using ltnflash and a bin of HS0K, checking the Update BootCode option. After that everything works as it should.
The guide instead of suggesting to flash the firmware with the exe tool from liteon should suggest the ltnflash procedure and update bootcode.
I noticed another strange behaviour of the patcher: if I patch the same original eeprom several times I get every time a different patched version, is this normal?