ASFKAP...you do not have much knowledge, unfortunately.
This is tricky if you don't know how to escape if something goes wrong.
First of all, this is not possible under Windows XP.
You need to start in DOS mode. That is of not much help if your harddrive is in NTFS format. To revert that to FAT32...Partition Magic with no guarantee of no data loss...
You can, however, use the Caledra DrDOS and access NTFS, but first you need to find that program.
This brings you only into the situation to be able to go through the process of flashing...now you need to find out what version your current unit has and select accordingly.....
In your case with limited knowledge I highly recommend NOT to try it as you may easily spoil your unit forever.
Sorry for not offering more help, but it would be almost a book to write as plenty of details will be required and a step by step explanation needs to take care about a couple of nasty bits which may cross your path.
