TO recover passewd, i need ur help!~~

to recover password of SCO UNIX OPENSERVER5..0.7.
i tried to boot from boot floppy and edit the passwd file.
but ,after i booting ,i cannot mount harddisk on ...i know that its
bcuz the harddisk is installed on an SCSI card...
so i download lsil.btld.img file from the SCO website, use
/images/floppycp.exe to make the btld floppy in windows.
and then, type defbootstr link=lsil at the "boot::" prompt ...
but :

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bootlocore: out of low(below 1Mb) memmory
No memmory for string table
No(or cannot load)kernel hd(40)unix symbol table
link failed, press <enter> or
...............................................

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i dont even know what to do next............HELPPP!
i really need your help.thanks much!

and,also,when u type link=lsil.....how the machine knows where to find
it whityout a path??

.