Fedora 25 LiveUSB can't boot on Dell XPS 13 (9343)

I have a Dell XPS 13 (9343) and I would like to try Fedora 25 from live USB. I prepared the USB drive using unetbootbin on Ubuntu using this file: Fedora-Workstation-Live-x86_64-25-1.3.iso (if I prepare the drive with Disks it is not recognized as UEFI bootable). I rebooted, selected the USB drive to boot from (UEFI secure), and I got the Fedora boot menu. I edited the grub params and removed the quiet flag to see what was going on. I got the following screen (I got the last message when I removed the pendrive - so the kernel was not totally dead!). The only thing I can do at this point is turn off the computer. What is wrong and how do I fix it? I'm surprised because Ubuntu works without hiccups and Fedora 25 on the XPS 13 is reported to be working fine by other users. PS. In the normal Ubuntu boot, the next message after the matching clocksource line in dmesg comes from systemd: [ 3.207740] clocksource: Switched to clocksource tsc [ 8.053957] EXT4-fs (dm-0): mounted filesystem with ordered data mode. Opts: (null) [ 8.732566] systemd: systemd 229 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN) [ 8.732673] systemd: Detected architecture x86-64.