solved the problem.
As stated, when I tried to run DOSFLASH in COMMAND PROMPT under Win XP just to see if there would be any error messages (as the DOS version just freezes and does not output anything) I saw that it seemed to not be able to scan my cd/dvd drives...
figured this would be the reason why the DOS version hangs as well...
went back into DOS and this time I issued a port command when running DOSFLASH
--> "dosflash 09E0" (09E0 being my SATA port where my 360 drive was connected)
--> that finally started DOSFLASH, different then what I have seen from other people but at least I was in there...
DOSFLASH presented me with an overview of parameters and options:
CODEDOSFLASH V1.8 Build 20090808 by Geremia, Modfreakz and Kai Schtrom
Choose a Command Set (1 for Manual Mode, 2 for LiteOn Extended Mode):
DOSFLASH [R|W|E] [PORT] [PORT TYPE] [DRIVE POS] [MTK TYPE] [FLASH TYPE]
[FLASH SIZE] [FLASH CHIP ERASE OPCODE] [FILE NAME]
[SEND ATAPI DEVICE RESET]
R: Read FLASH
W: Write FLASH
E: Erase FLASH
PORT: Port to send command to e.g. 0970
PORT TYPE: 0 for IDE, 1 for SATA
DRIVE POS: A0 for Master, B0 for Slave
MTK TYPE: 0 for 0x70 par, 1 for 0x73 ser, 2 for 0x72 ser
FLASH TYPE: 0 for normal handling, 1 for serial SST
FLASH SIZE: size of flash chip in number of banks
FLASH CHIP ERASE OPCODE: individual chip erase opcode command byte
this is only used for erasing a serial flash
FILE NAME: name of the file to read/write from/to flash
SEND ATAPI DEVICE RESET: 0 for no, 1 for yes
All numbers are intepreted as hex values!
so I basically ran all the usual commands just with DOSFLASH I had to set additional parameters...
1. "l-o-eras 09E0" (09E0 being my sata port number)
--> second time it returned status FF72
2. power off CK3
3. type command "dosflash liteon e 09E0"
4. power on CK3
5. press ENTER
--> erasing was successful
6. power off CK3
7. type "dosflash w 09E0 1 A0 2 0 4 fw.bin 0"
--> 09E0 being your my sata port
--> fw.bin being your hacked firmware
8. power on CK3
9. press ENTER
--> flashed all 4 banks successfully and I was able to recover BOTH drives !
Hope this helps somebody who has the same problems !
Thanx to everybody who contributed !!!