I'm having a major issue booting anything on my iMac (iMac11,2 - Intel Core i5/AMD FirePro 7200 - OC 2.2.0) after tampering with the EFI partition/Boot Manager. I have two operating systems on separate internal drives—Windows and Linux—but only the first internal drive has an EFI partition (the one with Linux on it), and OpenCore was previously installed and working on it. Every time I boot, I hear the chime, and then nothing—just a BSOD. The mouse and keyboard are working. I've tried all possible key combinations, but only the PRAM reset works. I also attempted an SMC reset, but to no avail. I can't boot from any drive anymore. I can't access Recovery, Internet Recovery, Target Disk Mode—nothing except the PRAM reset. I've tried different drives with macOS, Windows, and Linux live USB disks, but no luck. I tampered with the EFI partition because I was trying to restore the Linux option on the boot picker menu after an NVRAM reset deleted the entry. I also wiped the Boot Manager entries using a Linux live USB, which was the last time I successfully booted into anything, even if the EFI partition was already corrupted. Here is the command I typed in the Linux console: 'sudo efibootmgr -b * -B' with * for each boot entry. Then, I recreated the entries and sorted them to boot from Clover first (which I was trying to manually install in place of OC), but that was the last thing I did before restarting to where I am now.
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