[ubuntu] problem booting 16.04 live usb on baytrail tablet

I can't seem to get my live usb to boot on my Acer Switch10. It's a baytrail tablet that needs a 32bit EFI bootloader. I made a usb from the 16.04 64bit iso, and installed the bootia32.efi file in the EFI directory.
The machine boots the bootloader but drops me directly into a grub prompt. so I type the following.

linuxefi (hd0,gpt1)/casper/vmlinuz root=/dev/sda1
initrdefi /casper/initrd.img
boot

as soon as I hit enter after the boot command, I get a solid cursor and the machine hangs. It will not do anything. Any ideas?