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Has anyone figured how to upgrade to bootrom 427
i was on catalina and upgraded to BigSur after that i did a clean install of BigSur just to start fresh
i just noticed that my bootrom is still at 157
i have a 2014 macbook pro 15, 11.2
You need to install big sur firstly on original apple ssd. After that your bootrom got updated and then you can install (again) big sur on your target drive.
 
Question for those with modified but roms on 2013-2014 models. Do your internal drivers still show up as external when you hold the option key down on boot. I have the latest big sur boot rom 427 on my 2013 air and they still show up as external so I’m assuming I will still have hibernation issues.
 
You need to install big sur firstly on original apple ssd. After that your bootrom got updated and then you can install (again) big sur on your target drive.
i should've mentioned, my original SSD is completely dead
is there another solution to manually update the BootRom
 
i should've mentioned, my original SSD is completely dead
is there another solution to manually update the BootRom

Not that we known of. Big sur is the only one that actually updated the bootrom even when using unofficial ssd. But that still a lottery, although the chance is quite high.
 
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...my macbook pro 13" early 2015 (known as macbook 12,1) has successfully updated from latest version of Catalina to Big Sur - BootRom is now at 424....everything without having the original Apple SSD installed while updating...
My SSD is an adata 8200 SX8200pro
 
Why is the system consuming so much power? The processor consumes 4.24W in total. Who consumes the rest? I think it's SSD. I regret doing this procedure.

13 inch MacBook Pro A1502 (970 Evo with NVMeFix) (Boot ROM: 424.0)

@otosan
@mo5214

Ekran Resmi 2020-11-15 14.41.31.png
 

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Yes, i've seen 1.2A even with original SSD, so that aint strange under load condition.

as long as its not hike up to that current during idle, i guess nothing to worry about.

but then, 970 is always slightly hotter by default, because it supposed to be a high bandwith ssd.
My computer is 100 degrees at boot. It drops to 60 degrees after a few minutes. Then I click on safari. It becomes 100 degrees again and drops to 70 after a few seconds. Then I open another program and all this is repeated. Temperature changes very quickly. How will I solve this? I'm freaked out because of this problem.
 
I read about the Big Sur bootrom update here and decided I would try it out on my mid 2014 13" MacBook Pro (MacBookPro11,1), which has an HP EX900 SSD installed. I had patched the bootrom to have the newer NVME driver, but it was overwritten by a security update.
I downloaded the Big Sur installer onto my computer and was able to install to an external USB drive. This did update my bootrom to 427.0.0.0.0, and it has resolved my hibernation problems, as others have observed. I did not have to reinstall my original SSD for the update to take place.
I installed to an external USB drive so I could keep my Mojave install as-is without needing to restore from a backup, and it seems to have worked perfectly.
 
Hy guys! Here I am again with some small and quick I hope questions (mbp late 2013 with Sabrent 512GB):

I installed from scratch Mac OS Big Sur on my new SSD and my boot Rom is now 427.0 (wow). But... for now I really don't like the look and feel of the new OS so I went back to Catalina restoring my last TM backup. Now, I have of course nvmefix and so on already set but what about now? Can I delete this tool or I leave installed on my Mac? What about sleep and hibernation settings? May I have to reset to default or have to still use this from terminal "sudo pmset -a hibernatemode 0 standby 0 autopoweroff 0 darkwakes 0"?

Thankssss
 
I read about the Big Sur bootrom update here and decided I would try it out on my mid 2014 13" MacBook Pro (MacBookPro11,1), which has an HP EX900 SSD installed. I had patched the bootrom to have the newer NVME driver, but it was overwritten by a security update.
I downloaded the Big Sur installer onto my computer and was able to install to an external USB drive. This did update my bootrom to 427.0.0.0.0, and it has resolved my hibernation problems, as others have observed. I did not have to reinstall my original SSD for the update to take place.
I installed to an external USB drive so I could keep my Mojave install as-is without needing to restore from a backup, and it seems to have worked perfectly.

When you had the boot ROM patched do you remember if your internal drives showed up as external or not when you boot holding the option key.

I have bootrom 427 as well and they show up as external drives which i believe is what’s causing issues with boot camp and windows.
 
When you had the boot ROM patched do you remember if your internal drives showed up as external or not when you boot holding the option key.

I have bootrom 427 as well and they show up as external drives which i believe is what’s causing issues with boot camp and windows.
I had patched mine before 427 was a thing and they still appeared as external then as well. However I’ve not had any issues with Windows/Bootcamp with rom patched/unpatched nor on 427.
 
You need to install big sur firstly on original apple ssd. After that your bootrom got updated and then you can install (again) big sur on your target drive.
Ever since some maintenance release of Catalina, this should no longer be necessary.

i should've mentioned, my original SSD is completely dead
is there another solution to manually update the BootRom
Yes, that should be possible with certain operating system and EFI firmware combinations. See below.

Not that we known of. Big sur is the only one that actually updated the bootrom even when using unofficial ssd. But that still a lottery, although the chance is quite high.

I am still running macOS Catalina 10.15.7 (19H15) on my MacBookPro11,1, but updated from Boot ROM version 162.0.0.0.0 to Boot ROM version 427.0.0.0.0 that came with macOS Big Sur 11.0.1 (20B29).
Code:
sudo /usr/sbin/bless -firmware Desktop/Big\ Sur/MBP111.scap --verbose --recovery
Followed by a system shutdown (not restart), and immediate power on using the power button. You should see an Apple logo and progress bar; the firmware update should take about 1-2 minutes. Of course, this will not work with a patched, custom system firmware file; only with 'original' firmware files from Apple. I have not looked at the changes in the firmware prior to doing this; but the NVMe driver appears different (smaller?) and I will report back on any hibernation issues with the vanilla system firmware.

I didn't see details in this thread around where the EFI firmware files are located these days. The EFI firmware/Boot ROM/system firmware files are now hiding in ee3ab6c04234b360dd8fca93c0ae49f957bf0843/AssetData/boot/EFI/EFIPayloads from the archive /Volumes/Shared\ Support/com_apple_MobileAsset_MacSoftwareUpdate/ee3ab6c04234b360dd8fca93c0ae49f957bf0843.zip that was in the disk image Install\ macOS\ Big\ Sur.app/Contents/SharedSupport/SharedSupport.dmg.

Edit: Added the power off/power on instructions for clarity.
 
Last edited:
Sharing my results on Big Sur vs Catalina

2015 MBP 13" 2.7ghz i5 with 8GB RAM
SSD: Seagate Barracuda 510 500GB (Similar to Sabrent, E12 based), short sintech black adapter.

Big Sur:
- Cannot install Lilu and NVMeFix (Kernel Panics loading Lilu)
- Runtime (reported through activity monitor, full charge): ~9-9.5hrs
- Power Draw (iStats Menus): Min 0.00A SSD / Lowest 0.14A
- System Lowest: ~8W

- Notes: SSD seems to hit the 0.00A point more frequently on Big Sur, with or without the fan running.
- Overnight power loss (Default settings): ~9%

- Actual usage About 8hrs while watching youtube videos and browsing. Lid closed and in standby numerous times


Catalina:
- With Lilu and NVMeFix applied and running
- Runtime (reported through activity monitor, full charge): ~10-10.5hrs
- Power Draw (iStats Menus): Min: 0.00A, Lowest 0.09A
- System Lowest - 6.5W-8W

- Notes: SSD usually only ever reaches 0.00A after a resume, when the fans are not spinning, as soon as the fans spin up, SSD typically between 0.09A - 0.14A and never returns to 0.00A state (this is with NVMeFix installed)
- Overnight power loss (Default settings): 15-30%

- Actual usage About 6 to 8hrs while watching youtube videos and browsing. Lid closed and in standby numerous times.
 
When you had the boot ROM patched do you remember if your internal drives showed up as external or not when you boot holding the option key.

I have bootrom 427 as well and they show up as external drives which i believe is what’s causing issues with boot camp and windows.
I honestly don’t remember if it showed up as external; I suspect that it did. I must have seen it when I booted to the recovery partition when I was restoring my backup to the new SSD, but I have no recollection of it appearing external or not.
With 427.0.0.0.0, I also have it showing as external, though I am not dual-booting.
 
When you had the boot ROM patched do you remember if your internal drives showed up as external or not when you boot holding the option key.

I have bootrom 427 as well and they show up as external drives which i believe is what’s causing issues with boot camp and windows.
It will stay detected as external on bootloader screen. But it wont prevent you installing bootcamp,

dozen of my customers managed to install bootcamp on their 2013-2014 models just fine.

sometimes it boot to question mark folder during 1st reboot upon installation, but you just need to reboot again, holding alt button and choose the windows partition to continue the installation. And everything just work after that.
 
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Why is the system consuming so much power? The processor consumes 4.24W in total. Who consumes the rest? I think it's SSD. I regret doing this procedure.

13 inch MacBook Pro A1502 (970 Evo with NVMeFix) (Boot ROM: 424.0)

@otosan
@mo5214

View attachment 1668203
I just gonna say this again,

any Samsung NVME is not really a wise choice for anything except 15 inch Mid 2015 model (A1398)

a lot of people choose this ssd because most of video guide and early information related to this upgrade mostly use it as an example,

sure it has speed advantage in paper (which only applicable if you are on newer windows notebook, or on A1398 2015 model) and has 5 years warranty,

but during my experience of installing NVME to macbook, i never fan of those samsung ssds, and i never encourage my customer (especially macbook air users) to get one even when they asked me to do so,

i rather give them extra personal warranty and use other SSD with silicon motion or phison controller, rather than doing a later troubleshooting for glitch and issue happen with the evo series.

as for your case,

100° is terrible. You might want to check your fan or thermal paste as well.

but if you really into an experimentation, i suggest you to try another SSD available out there.

970 can be easily shipped off again to a PC or windows user. So you wont be at much lost there.
 
Hy guys! Here I am again with some small and quick I hope questions (mbp late 2013 with Sabrent 512GB):

I installed from scratch Mac OS Big Sur on my new SSD and my boot Rom is now 427.0 (wow). But... for now I really don't like the look and feel of the new OS so I went back to Catalina restoring my last TM backup. Now, I have of course nvmefix and so on already set but what about now? Can I delete this tool or I leave installed on my Mac? What about sleep and hibernation settings? May I have to reset to default or have to still use this from terminal "sudo pmset -a hibernatemode 0 standby 0 autopoweroff 0 darkwakes 0"?

Thankssss
With 427, you can try to use back the default pmset configuration.

just do : sudo pmset restoredefaults
 
This post #7,639 helped me upgrade my bootrom to 427.0.0.0.0 without installing Big Sur (and risking all the problems that it will bring). I have not yet installed a 3rd party SSD because I didn't want to have my MBA6,2 not functioning as stock as possible, I still use this computer daily for work without any issues (with a 2011 27' iMac as a screen).

I ordered an adapter and SSD ( Sintech NGFF M.2 nVME SSD Adapter Card for Upgrade MacBook Air(2013-2016 Year) and MacBook PRO(Late 2013-2015 Year) (Black) and QIVYNSRY M.2 NVME SSD Adapter Card AHCI SSD Upgrade Converter Card for MacBook Air 11“ A1465 13” A1466 (Mid 2013-2017), MacBook Pro 13“ A1502 15" A1398 (Late 2013 - Mid 2015), Mac Pro ME253 MD878 [I wanted to have two adaptors on hand in case one was defective] and the ADATA XPG SX6000 Lite 1TB PCIe 3D NAND PCIe Gen3x4 M.2 2280 NVMe 1.3 R/W up to 1800/1200MB/s SSD (ASX6000LNP-1TT-C)). I will report back with how well these work, as I am currently on a 128gig SSD in this MacBook (and can easily swap this NVMe drive into my desktop if I upgrade to the new M1 MBP over the next few months).
 
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Hello everybody:

I have one problem:

I have Macbook Pro Early 2015 13" with Adata SX8200 Pro 1TB and Mini Sintec Adapter working perfectly for almost 2 years now. I did the upgrade to Big sur on saturday. Because it did not upgrade bootrom with the Adada SSD, I upgraded Bootroom with original Apple SSD. Now Bootrom is 424.0.0.0.0.


Everything is working fine except for one Problem:
When I start my Macbook, during the bootscreen, it waits for around 37 seconds (after Login) to continue booting with the Adata SSD. (So booting requires in total about 43 seconds). Start drive is set correctly. The drive is encrypted with FileVault.


Is there a solution for this problem? Any posibilty to speed up booting?
 
*noob alert*

Hey guys,

So i've been running with a Rocket 1TB for a good few months on MBP 13" Late 2013 with good results. I modified the hibernation settings using the info in the first post

disable hibernation by typing "sudo pmset -a hibernatemode 0 standby 0 autopoweroff 0" in the terminal

Now that my BootROM has updated thanks to Big Sur I am wanting to "undo" the above command. What would be the default hibernation, standby, and autopoweroff values I would need to replace in the command to put my Mac back to it's "default" values.

Thanks again for everybody's help!

EDIT: I'm assuming if I type pmset restoredefaults that should do it? But just wanted to check.
 
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With 427, you can try to use back the default pmset configuration.

just do : sudo pmset restoredefaults
Thanks Otosan. So now I apply what you suggest me and here are the values that I have now:


Are they ok? I will test like this and I already can tell you that I just wake up my mbp after the night and it's still at 100% from yesterday!

Can you confirm also that nvmefix is fine and active? --> https://prnt.sc/vjznf8
 
Hello everybody:

I have one problem:

I have Macbook Pro Early 2015 13" with Adata SX8200 Pro 1TB and Mini Sintec Adapter working perfectly for almost 2 years now. I did the upgrade to Big sur on saturday. Because it did not upgrade bootrom with the Adada SSD, I upgraded Bootroom with original Apple SSD. Now Bootrom is 424.0.0.0.0.


Everything is working fine except for one Problem:
When I start my Macbook, during the bootscreen, it waits for around 37 seconds (after Login) to continue booting with the Adata SSD. (So booting requires in total about 43 seconds). Start drive is set correctly. The drive is encrypted with FileVault.


Is there a solution for this problem? Any posibilty to speed up booting?
My personal preference is to always turning off filevault,

unless i am working with an extra confidential data, i never found that feature to be benefitial for me,

it only cause more problem in a time where the macbook broken/has issue, and i actually need to access the data or do a fix in a simple manner.

And even though apple and a lot of people saying that it should not cost you the performance, i'll turn to real life scenario where plenty of customers come with a slow down and freezing issue after they "accidentally" turn filevault on during catalina update.

so, you might want to try to turn that off, and although you said that you set startup disk correctly, it wont hurt to do it one more time after turning off filevault,

because you said that you swapped to original ssd to update bootrom, which means there's change of drive ID, which normally is culprit for boot delay,

also, you might want to reset your NVRAM before set the startup disk for this case.
 
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