I have an macbook pro late 2011 15 inch (model identifier :MacBookPro8,2).

In the past, everything work fine and i was using oclp 0.6.7 on ventura. When 0.6.8 came out, I updated to that version and the update was successful. After using it, I felt that something was wrong (but unnecessary) so i downgraded back to 0.6.7 and I build opencore again. When I rebooted, the mac powers on and enters opencore and loads macos but the progress bar stops mid-way. I restarted with verbose and the mac stops at this. "(ACHI)(PRT)(001FO210) AbortCommands: :5381 :Port 1 - called, deviceWithError -1, errCode = 0xe0030007". And also, does 0.6.8 root patches work with 0.6.7? I then found my usb i used to install dosdude1's patched catalina but instead of installing catalina, I installed a time machine backup of macos high sierra 10.13.6. I then installed opencore 0.6.7 and tried installing ventura. When the installation says '15 minutes remaining' (I have not restarted), the screen blacks out.

The macbook was plugged in to the charger and the mac was still on. Only the screen powered off and the apple logo at the back was not glowing. When i force-restarted it, the mac goes to the usual white screen (for macs before 2013) but then blacks out and does not enter opencore.

A few days later, I realised that opencore may be the problem causing it and opencore possibly uninstalled itself? my shift key was stuck causing the mac to always enter safe boot but i somehow counter that with option key (i cannot get boot picker unless i enter normal os and enter a command to show boot picker on every boot) I entered internet recovery using shift+option+command+R (because shift key is stuck). When i had to key in the wifi password, that was when i knew shift key was stuck so i connected ethernet and when it loaded, i was greeted with the prohibited sign (the sign below

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Anyone has a soloution? I really want to revive this old mac.