I am having a hard time upgrading to Mojave in my E7250. Upgrade from App Store KPs after the first reboot, and my attempts to boot using a USB prepared as suggested in this forum and using the EFI and config.plist that I successfully used to install High Sierra KPs as well during the initial installation step. I noticed an issue with my initial HS installation, as I had not enabled the legacy ROMs in BIOS. However, enabling them does not help. Enabling Legacy ROMs KPs my currently installed HS system. I am enclosing the KP screen shot. Any help will be appreciated