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[Guide] Lenovo Yoga C930-13IKB (4K/i7-8550u) 99% working, updated 7 Feb

Joined
Oct 31, 2014
Messages
125
Motherboard
Lenovo LNVNB161216
CPU
i7-8550U
Graphics
UHD 620 (3840x2160)
Mobile Phone
  1. Android
Oh crap!!!

I tried to downgrade the BIOS and bricked it.
What do I do?!?
:((((
Damn. I have no clue :(

Still stuck on ALF after remaking the installer, copying all changed options from @Silent99's config.plist, formatting the external drive, reinstalling.

Edit: debug version… crashes?

280:389 00:030 OCSB: Secure boot is disabled, skipping
280:422 00:032 OCB: Arch filtering 28E29018(20484)->28E29018(20484) caps 4 - Success
280:452 00:030 OCB: Matching <> args on type 1 0
280:481 00:029 OCSB: Secure boot is disabled, skipping
280:508 00:027 OCB: Arch filtering 0(495616)->28D6E018(495616) caps 4 - Success
280:542 00:033 OCM: Failed to start image - Already started
280:569 00:027 BS: Failed to start OpenCore image - Already started

*reboots*
 
Last edited:
Joined
Jun 21, 2012
Messages
24
Motherboard
LNVNB161216
CPU
i7-8550u
Graphics
UHD 620 (3840x2160)
Damn. I have no clue :(

Still stuck on ALF after remaking the installer, copying all changed options from @Silent99's config.plist, formatting the external drive, reinstalling.

Edit: debug version… crashes?

280:389 00:030 OCSB: Secure boot is disabled, skipping
280:422 00:032 OCB: Arch filtering 28E29018(20484)->28E29018(20484) caps 4 - Success
280:452 00:030 OCB: Matching <> args on type 1 0
280:481 00:029 OCSB: Secure boot is disabled, skipping
280:508 00:027 OCB: Arch filtering 0(495616)->28D6E018(495616) caps 4 - Success
280:542 00:033 OCM: Failed to start image - Already started
280:569 00:027 BS: Failed to start OpenCore image - Already started

*reboots*
I can post the EFI from my installer as well, as that will probably have a slightly different config.plist and you can try that. I do want to mention that upon my first install as soon as I was able to boot into Big Sur I used Carbon Copy Cloner to clone my macOS partition to a backup. At the time, it was just to boot off an external drive until I was certain I had Big Sur working decently. When restarting into Big Sur I could never get it to load up, but when I loaded the CCC backup on my external drive it booted perfectly well. I then cloned that back over the top of my internal SSD install and never had a problem booting again. My cloning was on the final step of install, where the OS itself is accessible and there is no prompt to restart. I'm not sure why this worked or what step I overrode, but it gives me a functioning install that I can update. I also changed the scaling to 2048 x 1152 to reduce the flickering which now only occurs on some videos but not in regular laptop use. I'm using the newest BIOS with no problems. I thought the BIOS f'ed up my system, but that's just because I had the OC menu set to hidden and after the BIOS update OC was no longer defaulting to Big Sur but to Windows.

Here's the version I use for my installer, I don't think I changed much though.
 

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Joined
Jun 21, 2012
Messages
24
Motherboard
LNVNB161216
CPU
i7-8550u
Graphics
UHD 620 (3840x2160)
Oh crap!!!

I tried to downgrade the BIOS and bricked it.
What do I do?!?
:((((
If you don't have any software options, you could use a CH341a to write directly to the chip by opening the back of the laptop. The kit is probably around 15 bucks.

Ex. on YouTube (not sure if I'm allowed to submit links so will give title for you to search):

How to use a BIOS flasher w/ Test clip to flash BIOS and EEPROM chips in Linux/Windows​

The lens on my phone cam got crunched but here is a fuzzy picture of the BIOS chip, not to be confused with the identical EEPROM (in photo chip is directly to right of heat sink screw):
 

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Last edited:
Joined
Oct 31, 2014
Messages
125
Motherboard
Lenovo LNVNB161216
CPU
i7-8550U
Graphics
UHD 620 (3840x2160)
Mobile Phone
  1. Android
I can post the EFI from my installer as well, as that will probably have a slightly different config.plist and you can try that. I do want to mention that upon my first install as soon as I was able to boot into Big Sur I used Carbon Copy Cloner to clone my macOS partition to a backup. At the time, it was just to boot off an external drive until I was certain I had Big Sur working decently. When restarting into Big Sur I could never get it to load up, but when I loaded the CCC backup on my external drive it booted perfectly well. I then cloned that back over the top of my internal SSD install and never had a problem booting again. My cloning was on the final step of install, where the OS itself is accessible and there is no prompt to restart. I'm not sure why this worked or what step I overrode, but it gives me a functioning install that I can update. I also changed the scaling to 2048 x 1152 to reduce the flickering which now only occurs on some videos but not in regular laptop use. I'm using the newest BIOS with no problems. I thought the BIOS f'ed up my system, but that's just because I had the OC menu set to hidden and after the BIOS update OC was no longer defaulting to Big Sur but to Windows.

Here's the version I use for my installer, I don't think I changed much though.
Thank you!

The installer goes through, both first and second pass. I can't boot, though – can that be a third install pass?

I've also been looking at this log and "Waiting for DSMOS" appears right before – not sure whether that's coincidental. VirtualSMC is in, I tried FakeSMC as well, but that's not it.

So what you have done was – you installed Big Sur on an external drive, passed the first boot correctly (the process I seem to be failing at), and then you used CCC? If yes, then I'd love your install EFI folder, please – I am completely stumped (and I hate it when machines don't do what I want).

Keeping fingers crossed, @elvisior!
 
Joined
Jun 21, 2012
Messages
24
Motherboard
LNVNB161216
CPU
i7-8550u
Graphics
UHD 620 (3840x2160)
Thank you!

The installer goes through, both first and second pass. I can't boot, though – can that be a third install pass?

I've also been looking at this log and "Waiting for DSMOS" appears right before – not sure whether that's coincidental. VirtualSMC is in, I tried FakeSMC as well, but that's not it.

So what you have done was – you installed Big Sur on an external drive, passed the first boot correctly (the process I seem to be failing at), and then you used CCC? If yes, then I'd love your install EFI folder, please – I am completely stumped (and I hate it when machines don't do what I want).

Keeping fingers crossed, @elvisior!
I installed Big Sur to my internal and CCC'd it immediately to an external as soon as I had full access to the OS, then I CCC'd it back and overwrote the original partition. I'm pretty sure that's at the end of second boot? After you are asked to enter region, user info, etc.
 
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