Used MPB 16 bricked after seller remotely erased it My recently purchased MBP 16 (used, from eBay) suddenly crashed and upon restart, would not find the internal SSD to boot up. It would show the questionmark-folder icon flashing. After rebooting and pressing the option key, I didn't see anything. Not my internal SSD nor my connected Windows Bootcamp drive. I had previously asked the seller to remove the device from his &quot;Find My&quot; App. I quickly gave him a call, and indeed that was what had happened.
TLDR;

MBP is bricked and won't recover from the Internet (error 2004f, 2003f and 2005f)
Won't start Bootcamp
Doesn't &quot;see&quot; macOS Big Sur installation drive (for manual recovery by reinstalling the OS)
Recovery Mode doesn't work at all
Resetting NVRAM won't help
Seller pretty much remotely bricked it by accident

The seller called Apple Support and they told him that he probably remote erased my whole machine, which is usually done after theft or losing a device. He did it by accident via his iPhone, which did not distinguish between the option to simply remove a device and completely erasing (and locking) it.
After contacting the Apple Support Chat, we didn't really come closer to finding a working solution. He told me to try and manually install it via a removable drive to run the macOS Big Sur installation or to bring it in for repair.
All of this pretty much happened, because the device wasn't properly reset and prepared to be sold per Apple's official documentation.
Does anyone know what I can do on my end to repair this?
Any feedback and/or help is very much appreciated. I do hope that this thread can serve as a reference point for others encountering the same issue in the future.
Related: &quot;How I sold an old Mac and unknowingly had access to its location for over 3 years&quot;
Apple covers exactly what to do to protect both sellers and buyers when exchanging hardware.

https://support.apple.com/en-us/HT201065

Often, only the original purchaser, with proof of purchase can get Apple to bypass an activation lock or firmware password.

https://support.apple.com/guide/findmy-mac/activation-lock-and-find-my-on-mac-fmm2dd428a48/mac
https://support.apple.com/en-us/HT204455