it's the same using the v5.0.4 as the Latest.when i choose usb from the boot menu the computer reboot automaticly and then whenever i choose f1 (boot from grldr),or f2(boot from syslinux) they all show "-".
i think maybe the plpbt.bin does not Compatible with fbinst(a boot manager as i have Introducted above).so i will use the plop manager as my default manager ,but finally i find i don't know how to install the plop to my netaec u disk.

,i have to read the Manual a moment.
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or possiblely it's sucessful .AS long as the computer restarted automatically before,we usually can go to fbinst menu,only show "-" on the notebook. maybe it have noing to do with plop,But fbinst's bug.
WELL,let's we Ignore the notebook. but most people's freebak to me is when they choose usb from the boot menu,they hanged ,and usually the keybord Invalid too.and have to Cold start.