I went to the ASUS website for ASUS P4SGX-MX and their latest vesion is a 1006 Betta version. Is your patch the same or different?
can't remember but i always opted for the latest version when patching it back then. just download it and take a look.
If it is fine where can I find the AFLASH with higher version?
it should be. i don't see a reason why it shouldn't. just check out ASUS' site for the latest flasher.
Another question! .. I have not any floppy disk for doing this and I am using a bootable CD. Is this possible?
yes it is. there are readymade boot images available. just use a search engine to find the right one for you

If you email me include [WIMSBIOS] in the subject.