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02-17-2026, 09:47 AM
Hi everyone,
I’m an IT technician, programmer, and longtime PC enthusiast. I’m reaching out to this community in hopes of finding some information—or ideally, a modded BIOS—for my Lenovo ThinkCentre M75q-1 (AMD processor with Vega 8 integrated graphics).
I am currently working on a Hackintosh project and trying to boot macOS on this machine. Because it’s an AMD APU, macOS strictly requires a minimum of 512MB of allocated VRAM from the BIOS to boot successfully. Unfortunately, my UMA Frame Buffer Size is completely locked at 256MB.
Beyond just hitting the 512MB minimum, I am also curious: is it possible to unlock even higher VRAM allocations (e.g., 1GB or 2GB)? If anyone has experience with this, I'd love to know the practical implications and performance benefits of doing so on this Vega 8 setup. Additionally, are there any hardware repercussions, stability issues, or known risks (like memory mapping errors or overheating) associated with forcing this modification on this specific Lenovo motherboard?
What I’ve tried so far:
Official Updates: I've tested the latest official BIOS (available here: https://support.lenovo.com/it/it/downloa...75q-1/1000 ).
Downgrading: I tried downgrading to various 2021 BIOS versions, as some users reported the UMA setting was accessible back then, but the option remained unavailable.
Third-Party Tools: I booted into Smokeless UMAF (Universal AMD Form Browser) to try and bypass the hidden menus and force the change. Unfortunately, it seems these specific AMD CBS/PBS options are completely "armored" or hardcoded on this board, and I couldn't alter the Frame Buffer size.
Does anyone have a modded BIOS for the M75q-1 that unlocks the Advanced Menus or specifically allows changing the UMA Frame Buffer Size? Alternatively, if anyone knows a workaround or a specific variable to edit via EFI shell to unlock this setting, I would greatly appreciate the guidance.
Please note that I do not currently own a hardware programmer (like a CH341A). However, if a direct hardware flash is the only way to bypass Lenovo's protections, I am absolutely willing to purchase one to get this done.
Thanks in advance for your time and expertise! AdoniS4U
I’m an IT technician, programmer, and longtime PC enthusiast. I’m reaching out to this community in hopes of finding some information—or ideally, a modded BIOS—for my Lenovo ThinkCentre M75q-1 (AMD processor with Vega 8 integrated graphics).
I am currently working on a Hackintosh project and trying to boot macOS on this machine. Because it’s an AMD APU, macOS strictly requires a minimum of 512MB of allocated VRAM from the BIOS to boot successfully. Unfortunately, my UMA Frame Buffer Size is completely locked at 256MB.
Beyond just hitting the 512MB minimum, I am also curious: is it possible to unlock even higher VRAM allocations (e.g., 1GB or 2GB)? If anyone has experience with this, I'd love to know the practical implications and performance benefits of doing so on this Vega 8 setup. Additionally, are there any hardware repercussions, stability issues, or known risks (like memory mapping errors or overheating) associated with forcing this modification on this specific Lenovo motherboard?
What I’ve tried so far:
Official Updates: I've tested the latest official BIOS (available here: https://support.lenovo.com/it/it/downloa...75q-1/1000 ).
Downgrading: I tried downgrading to various 2021 BIOS versions, as some users reported the UMA setting was accessible back then, but the option remained unavailable.
Third-Party Tools: I booted into Smokeless UMAF (Universal AMD Form Browser) to try and bypass the hidden menus and force the change. Unfortunately, it seems these specific AMD CBS/PBS options are completely "armored" or hardcoded on this board, and I couldn't alter the Frame Buffer size.
Does anyone have a modded BIOS for the M75q-1 that unlocks the Advanced Menus or specifically allows changing the UMA Frame Buffer Size? Alternatively, if anyone knows a workaround or a specific variable to edit via EFI shell to unlock this setting, I would greatly appreciate the guidance.
Please note that I do not currently own a hardware programmer (like a CH341A). However, if a direct hardware flash is the only way to bypass Lenovo's protections, I am absolutely willing to purchase one to get this done.
Thanks in advance for your time and expertise! AdoniS4U
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