slow boot after unlock?

Hi all! First, let me thank you all for taking the time to participate in this community! I very much appreciate your time, energy and experience.

I've done several macbook pro unlocks by reprogramming the bios chip with an unlocked bios dump. So far I am successful in unlocking them, but in several instances the boot time is way slower than it should be, minutes. I saw thaGhosts tutorial here:
https://www.ghostlyhaks.com/blog/blog/hacking/18-how-to-bypass-apple-efi-firmware-lock
When I read the part about editing the bios dump - Its kind of confusing because the way its worded its seems to me that it was telling me to edit the file and replace the 128 bytes with FFs, then ignore that file and use a clean dump. Am I right in presuming that I should be doing that to the unlocked dump from my donor macbook?
I saw the part about editing the serial in, and that got me to thinking - do I need to edit anything else? For example, the MAC address?

In some postings from one of the services offering unlock, I saw a reference to how they 'rebuild the tables' in the rom then send it back to you. Any idea what they could be doing?

I'm wondering if I am missing editing something that could be causing it to boot so slowly. On several of the units, with a fresh load of yosemite, it takes a minute or more for the progress bar to move all the way across.

So folks, I welcome your thoughts. Has anyone else experienced this? Are there other things I should be patching?

thanks!

I used a rom from a dead board that was never locked. I have several, I'll zip them up for you when I get a chance.
So what is the area we 'ff' out?
I have changed the serials to match. I was wondering if boot hang could be because of mac address mismatch during boot process. I tried to upgrade both efi and smc firmware, but I'm not sure that either worked. I had to force both, and the when I rebooted for the efi, nothing seemed different about the boot process. When I did the smc firmware, i saw a message about matching data and then it restarted (from efi shell).

They are running from hdd, I havent tried sdd, but it still seems slow.

Same problem here. After clean efi of icloud lock and reset pram, load osx too slow.
Is there a way to force efi update?

Could you explain how to do? I know how to force smc upgrade or downgrade but not for efi

Any update?

hi, here's two links:
http://forums.macrumors.com/showthread.php?t=1122338&page=70
and
https://pubmem.wordpress.com/2011/04/09/flash-efi-firmware-update-manually-on-a-macbook-51/

Between these two you should have enough to do it, I can't find the original page I used.
For the efi, I pulled it out of the pkg, then used the command given to bless it. I'm not sure that it worked however, and I havent had a chance to go back and try it again (work vs play). For the smc, once you have copied the .scap out of the package, you have to format a fat32 usb stick, and put boot.efi and smcflasher.efi on it, along with the scap. Then you boot to the efi shell (option key, select usb) and flash.

Hi

If anyone could assist me, I have successfully "cleaned" and written back the efi on a 2014 macbook air, But it just sits loading forever and never gets any further.
i have tried writing a firmware from the download repository with no luck same thing... I am trying to force an efi update but any help will be appreciated.!

your first read was not good so now you have is a corrupt efi firmware. find one or two different efi dumps for the same macbook, and first CLEAN Me region and change your serial number and try that

Just my 2pence worth, but I've had 3 identical machines and 2 had mx25l6406e and the 3rd was a different chip (didn't need to -c command to find it, can't remember what it was specifically) but anyway I mixed up the clean bins and flashed to the wrong chips. Flash went fine and verified , but boot up on those 2 machines was slow. Once booted (it's not an age to boot but slower that the correctly flashed one) it runs perfectly!
Could this possibly be a bit of an issue?
Like I say it causes no other problems at all than a slower boot up

lol...I knew what I'd done when they were slower to boot but as I'd put them back together and they performed fine apart from the slightly longer boot time, I couldn't be arsed to re do the pair of them haha...I may re do them some day!

Hi Thank you all

I just wanted to update and let you know i had to Set a Clean ME, did the trick all perfect.!

drexxx wrote: Hi Thank you all

I just wanted to update and let you know i had to Set a Clean ME, did the trick all perfect.!