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Ok so apparently its thinkcenter’s firmware that only supports windows in uefi mode (those idiots hardcoded it only for windows) so there are 2 workarounds:
as mentioned in earlier discussion
1. Using gpart with fox lenovo flair (not for me cuz gpart only works on bsd)
2. Using legacy (BIOS Mode) for both live env of usb and bios itself
But when I try to do second option it thinks that usb has already installed os on it and attemps to run it. Legacy mode quirk I guess. Please help me, It is such headche and I’m so tired.