well i found a way around this. i saw someone recommend ploplinux somewhere, because you can install an plop boot order menu if you boot from this iso (dvd plop version 19 (- 2.3 gb iso)).
(you do not need to install the entire os, or boot into it !)
so i burned it on a dvdrw, and booted from this iso., at first i had some difficulties because my old
pc would boot right through the menu, (keyboard defect - typematic rate setting, cannot alter it - so if i press enter at the bios boot menu for booting from cd/dvd it registers multiple enter keypresses sometimes), but then i got in, so you must select install plop boot order menu, then install option 1 (as i recall), and reboot (remove dvd from drive). quickly enter your usb stick in the usb socket during reboot, and wait. if everything goes well you get to see some fancy (demoscene looking) menu which allows you to boot from usb or dvd or hdd. ! now it worked ! i installed batocera and its done !