external hard drive for macbook pro retina

I am attaching the readout from Terminal I am getting currently when I try to update it in case anyone here can decipher why the firmware is still not updating. I tried this workaround here to update the firmware despite the third-party drive, but haven't been able to get it to work. I can't currently can't upgrade to Monterey because the person who we bought the computer from swapped out the original OEM SSD hard drive for a third-party SSD drive, so the OS won't update the system firmware and install Monetery. I'm trying to upgrade from Mac OS Catalina to Monetery because GoodNotes on my Macbook stopped synching with it on my iPad because the version on my Macbook is too old, and I can't update it because Catalina is too old. Does anyone know what the original OEM SSD hard drive for a mid 2015 15-inch Retina MacBook Pro (model identifier MacBookPro11,4) is, and how I can buy a used one, and/or how to fix the error in Terminal I'm getting while trying to manually upgrade the firmware?

External hard drive for macbook pro retina