A1286 stuck during boot after motherboard upgrade

[kirillcy]

Hello everyone,

a couple of days ago I finally decided to replace the motherboard of my old MacBook pro 2011 with another one from 2012 year. The reason is obvious and sad - dedicated GPU issues. So my previous motherboard model is 820-2915-A, and the new one is 820-3330-B. I swapped motherboards without any trouble. Then I tried to boot and stuck on Apple's logo, it didn't surprise me and I decided to reinstall mac os. I use my previously prepared USB flash with Catalina patcher by dosdude. I successfully booted from this flash, tried to reinstall Catalina, got the message 'Not enough space on HDD' and it was fair cause it hasn't been formatted. But then instead of doing proper steps and try again, I applied the post-install patches. It was a stupid mistake, but for some reason I did it..

Now I am not able to boot from any devices or recovery, any try stuck prior to initialization. Even if I remove HDD and try to boot from USB, or internet recovery - stuck on Apple's logo. Of course, I tried reset SMC, PRAM, NVRAM but it does not help. The only maybe helpful information I can get during boot is single user mode booting logs. It shows something like that in the middle of the logs:

panic "Unable to find driver for this patform: MacBookPro9,1"​

Also, I attached the screen of the latest log message during boot, sorry for the quality.
I hope my MacBook is not totally bricked, please kindly help. Any suggestion, any clue how to solve it really appreciated.
Thanks!

 

[appltech]

Wow. I'm not sure will Target Disk Mode/Apple Configurator work (you'll need a separate Mac and appropriate cable)

 

[kirillcy]

I have a question for @dosdude1 - is there any chance of corrupting UEFI firmware if I use post-install Catalina patches?

 

[dosdude1]

I have a question for @dosdude1 - is there any chance of corrupting UEFI firmware if I use post-install Catalina patches?

Not at all, but you don’t need any patches for a 9,1, they support Catalina natively. Just do a clean install of Catalina.

 

[jav6454]

Clean install Catalina. It's a weird situation.

 

[kirillcy]

Continue the story...
Yesterday, I ran Apple hardware test, using command+D combination on boot, it successfully started, but after an hour progress stuck and I decided to restart mac and try again. The strange thing is the system booted up normally into my previous Catalina on hdd! I've seen just small GPU glitches sometimes, guess due to the absence of correct drivers. So I created installation Catalina usb, loaded from it, format hdd and started the installation process. It was going smoothly, until after one of the reboots I got the black screen again... I noticed that mac was really hot. But anyway I faced again with black screen problem, now on mid-2012 model...
There is no chime, just a front panel led and typical dvdrom sound on boot, screen still black.
Any ideas?