John Slayton

Hello, I'm trying to get My Mxq pro 4k Box going. It will start to a screen that say's "android". I think the problem had something to do with a power outage. How can I boot from a Usb thumb drive or Sd card I'v tried just copying a uncompressed copy of multitool and writing a copy with Usbimager am I missing something ? Is there a way to replace the factory image with a whole new on ? Armbian ? Is there a Image with test tool's for these things Media Box's ? Thank you