[tetsuya]

the thing is, if there aren't multiple boot devices, then it completely skips showing the menu, and the part where it looks for keyboard input.

If there are multiple boot devices and you hit something other than ESC, then it boots the first USB device, which is the best explanation for what happened to you. It doesn't explain why your USB device isn't being detected reliably though.

I just used your script to install the new seabios and firmware and it will not read any of my USBsticks anymore. Do you happen to know the
correct command to flash the previous files from flashrom in linux?

Edit: I copied cros_installer, crossystem, and futility from chromiumos

Code:

cd /mount_point/ROOT-A/usr/bin
sudo cp -av cros_installer crossystem futility /usr/bin
sudo cp -avr ./old_bins/ /usr/bin
sudo cp /mount_point/usr/sbin/flashrom /usr/sbin/flashrom-google

I was able to flash coreboot-panther-20140521_143421-md.rom, but when I flashed asus-chromebox-SeaBIOS-new.bin,
ROM image contains too many regions
FAILED

Do you know what I should do to fix this.

Edit 2: It seems everything works now, but do you know what that output from the SeaBIOS flash was about.

Edit 3: It would probably be a better idea to make directories for these files in your home directory and add them to your path, if you want
to be able to flash back when you can't boot from a USB stick.

Code:

~/usr/bin
~/usr/bin/old_bins
~/usr/sbin
ln -s ~/usr/bin/old_bins /usr/bin/old_bins