Install Big Sur without a USB

Hello all,

I have a MacBook Pro that is a 2009, and I would like to get Big Sur on it. I don't want to get a USB, and I have tried installing it via the installer that I made through open core. Will I need a USB? Or can I install it without? Thanks in advance.

Computer specs: Core 2 Duo 2.5 8 GB DDR3 128 GB SSD

submitted by /u/haw8411
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