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unable to boot from usb

  1. M

    MP 1,1-5,1 MP3, 1 with Catalina unable to Recovery Mode & Boot from USB Installer

    Hi, My MP 3,1 (2008) has installed "Catalina" and run smoothly! Question: 1) There's definitely NO Recovery Mode for DosDude version? Any alternative way? 2) I'm not able to "Option + Power" to launch the boot from USB Installer. What's your suggestion?
    • mactreouser
    • Thread
    • dosdude catalina patcher macpro 3.1 recovery mode unable to boot from usb
    • Replies: 4
    • Forum: Mac Pro
  2. bboypwr07

    Help please! recovery hd locked and i cant reinstall or unmount the disks

    hello! please anyone can help me. I have the same problem! recovery HD its locked and I can't reinstall os. I try all the commands that you guys give. nothing work please help!! If it helps I have all my passwords!
    • bboypwr07
    • Thread
    • hard drive locked hd reinstall unable to boot from usb unable to unmount
    • Replies: 5
    • Forum: MacBook Pro
  3. X

    Resolved OSX install from USB won't boot on PC

    Hello, I have a perfectly working El Capitan installer on flash drive. I know it works because I installed from it on a MAC mini yesterday. I wanted to use it on my PC running Windows 10, a Sony Vaio, in order to install MAC on a an external HDD. But no luck, the flash drive just won't boot. My...
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