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efi

  1. KayvK

    Looking to flash older firmware onto an iMac 5k Late 2015 (17,1)

    I've extracted the firmware files from the Sierra installer. An older guide (https://forums.macrumors.com/threads/guide-how-to-get-back-old-efi-after-downgrade-from-yosemite.1803934/) said to flash the .scap files using the bless command. The only problem? Any iMac newer than 15,1 only has a .fd...
  2. D

    Running Windows through Bootcamp on a MacBook Pro 2011 17" with disabled dGPU?

    Hi everyone, First post! I have a Macbook Pro 2011 17" with a permanently disabled AMD dGPU (modified EFI through Linux and also removed resistor R8911 to cut voltage to the dGPU). Currently running Sierra as an easy option to retain the control of brightness with the least effort. I know my...
  3. A

    Corrupted EFI partition map or APFS container?

    My Macbook Pro (2012, latest Mojave) started having some hickups not long ago where the screen would freeze for a minute or two and then go back to normal. Then one time it just got really slow and froze up every 10 seconds so I tried to shut it down but it would only shut down to a black screen...
  4. M

    MP 1,1-5,1 Mac 1,1 With no operating system

    Hello! I recently bought an old Mac Pro 1,1 I managed to get it working with a Windows copy. However when messing around with the hard drive portions I somehow made it worse. Long story short I got a clean hard drive with no operating system and have no idea how to get in to “bios”/ Efi to...
  5. N

    Request: A1466 EMC2925 Bios

    Hi there! I'm having trouble with this 13" MacBook Air. The computer turns on, fan spins, all power rails OK, but no chime, no backlight, etc. So, I removed the U6100 and soldered one from a non-identical non-donor board, and it works "OK"*, so... The firmware is corrupt. Does anyone have a...
  6. nigification

    MP 1,1-5,1 Mac EFI Roms for GPU's .. Am I missing something?

    Hey guys, this is my first post here. So I'm currently running a Mac Pro 4,1-5,1 on High Sierra with a GTX 960 4G card. All is well, although obviously, the lack of boot screen support blows. I've been reading this forum, along with a few of those personal websites that a few have published...
  7. T

    Is there an eficheck tool for Arm Macs?

    Earlier Macs had the possibility to check the EFI firmware or even create a complete dump of it from within the OS: https://www.macrumors.com/2017/09/25/macos-high-sierra-weekly-efi-security-check/ https://eclecticlight.co/2018/06/02/how-high-sierra-checks-your-efi-firmware/ This was...
  8. MartinNobel

    Hidden EFI Menu on the original iMac4,1 firmware

    Hey everyone, Around a month ago I got my hands on a 2006 iMac5,1 with an Intel Core 2 Duo with the intention of attempting to access the hidden generic EFI menu on the original iMac4,1 firmware documented on this forum...
  9. T

    MP 1,1-5,1 MP 4.1/5.1 Recovery mode/boot screen won't work at all

    Hi! At start I'm very sorry for my English. It's not my mother tounge. I'm quite new in this. All I wanted is cheap Mac device that is quite powerfull so I bought 2009 Mac Pro with HD 5870. All I did was to change graphics card so I bought RX 470 and Installed it. Beacuse I wanted to play some...
  10. robertcoogan

    Problems with chnages to firmware on boot

    I used to use rEFInd as a boot loader, but with the upgrade to Big Sur there have apparently been changes to the firmware that interferes with rEFInd's operation. So I am back to holding down the option key. Yay. <--(sarcasm) If I tried to boot normally, rEFInd should kick in and take me to...
  11. C

    Clover efi bootloader attack on 2014 Mac Mini?

    I went away for the Christmas holiday only to return to days later to see that my Mac mini head crashed and on the screen was displayed the boot loader screen for the clover efi. I believe clover is related to running macOS on a hackintosh. I don’t know much more about it than that. My internal...
  12. pizzabox

    No Apple Hardware Test on 2012 MBP?

    I am trying to run Apple Hardware Test. When I try to boot into it I get sent to internet recovery, then after a while I get an error on a black screen: Error message: Cannot Load "EFI/DRIVERS/TESTSUPPORT.EFI This thread on the Apple forum suggests it's broken now for older systems. I did...
  13. Matt T

    Possible to use two Bluetooth HCI controllers concurrently?

    I have a 2011 iMac with Bluetooth 2.1, and recently purchased a Bluetooth 4.0 USB dongle required for my new wireless mouse. The dongle works great - I paired my mouse and keyboard to it without issue and used the following terminal command to ensure macOS uses the dongle instead of the...
  14. Matt T

    Possible to use two Bluetooth HCI controllers concurrently?

    I have a 2011 iMac with Bluetooth 2.1, and recently purchased a Bluetooth 4.0 USB dongle required for my new wireless mouse. The dongle works great - I paired my mouse and keyboard to it without issue and used the following terminal command to ensure macOS uses the dongle instead of the...
  15. mothchip

    iMac 4,1 can't update EFI or SMC firmware

    Hello! I hope this is the right place. I tried to post to the Netkas forums but it's not sending me an activation email for some reason. I have an iMac 4,1 I picked up from a garage sale that I'm trying to install Linux to, but can't. I believe the core issue is that I cannot update the boot...
  16. explit

    MP 1,1-5,1 Mac Pro 4.1(5.1) Windows Problem with flashed EFI Cards.

    Hello Guys: I have a Problem with Mac Pro 4.1(5.1). I have flashed 2x Graphic Cards wit mac EFI ROM to have a Boot Screen: MSI R9 280 GAMING 3G MSI R9 280X GAMING 3G Both Graphic Cards works very good in MacOS Mojave, but as soon i start Windows 10 on the Mac Pro, i get a black Screen and...
  17. D

    I tried to install Windows 10 Pro using BootCamp and now the EFI boot screen is blank (black)

    I am using a Mac Pro 2013 6-Core 3.5GHz 64GB RAM Dual D500 machine with a fresh install of macOS Catalina 10.5.3 which was working like a charm (flawlessly) until I tried to install Windows 10 Pro (64 bits) using BootCamp, everything went fine until macOS asked to reboot the machine to continue...
  18. longbottle

    MP 1,1-5,1 Windows 10 x64 on MP 2,1 with 64GB RAM: only 32GB shows usable

    I recently used an old HP with UEFI to install Windows 10 x64 onto a pre-made Boot Camp partition on the hard drive in my MP. Everything went surprisingly well with it, except I'm surprised to find that the RAM only shows 32GB usable, even though Windows detected all 64GB in my MP. I know the MP...
  19. S

    MP 1,1-5,1 GTX 960 SSC EFI flashing For MacPro 5.1

    Am having EVGA GTX 960 SSC using for windows PC ,can be able to flash for MacPro 5.1,Please guide how to EFI flash GTX model,there was any definitive guide for Flashing EFI Flashing same EFI rom can be used for all same category for GTX model example EVGA GTX 960 SSC 2GB ,same EFI rom can be...
  20. ThatGrimshaw

    MacBook Pro Only Boots UEFI Volumes—No Legacy Mode

    Hey everyone, this is my first post on the forums. Since Saturday, I've been fiddling with a Late 2008 MacBook Pro (15"). For whatever reason, it just does not want Windows installed on it. I've tried about 5 different Windows XP ISOs (booting from both CDs and flash drives) and none of them are...