Faked Macbook Pro information shown in MacOSX window

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There isn't any possible way to make System Information show anything other than the detected hardware. The only way the seller could have posted these images is:

1. They're from another Mac to begin with. Show images from newer hardware, but ship you something entirely different.
2. They used Photoshop, or some other image editing software to change the screen shots. Again, with information from an entirely different Mac than what you received.

You clearly didn't read my previous post. To repeat:

It's impossible to get a Mac to show any specs in System Information than is different from reality. The OS polls the hardware directly to get that information, then displays it.

The seller either altered the screen shots after the fact. Or, far more likely, the screen shots are from an entirely different Mac from what you were sent.

There are only two possibilities here:

1. The seller made an honest mistake. That is, they had two Macs for sale, and sent you the wrong one. Contact the seller and let them know you got the wrong item and need to exchange it.
2. The seller knows darn well they sent you an older Mac than what you were expecting. In short, you were scammed.

It would have been much easier for everyone had you posted the images with your message. I've done that, and blanked out information no one has any business knowing. Mainly, your Mac's serial number and UUID.

You should remove the images from DropBox for just that reason.

A friend of mine got a second hand Macbook Pro that showed corei7, 16GB of RAM

as you can see in these pictures https://www.dropbox.com/s/z4wjax8z9w194pv/Pantalla-Retina.png?dl=0

https://www.dropbox.com/s/eztovc90xoz3nz4/Info%20Principal.png?dl=0

https://www.dropbox.com/s/8curk90avp3kife/CPU-1.png?dl=0

but in real it was a 2009 Macbook Pro with an Intel dualcore CPU,

what a scam!

You can post screenshots/images here, if you want more eyes on your issue:

You have completey changed your initial post which was about DNS not working. If you want meaningful replies you should not change a question and you should post different question topic in separate threads.

So my reply above is meaningless with respect to your edited question.

You haven’t shown any evidence that this is a 2009 machine. The CPU in that machine is an Intel Core i7. That particular type of Core i7 only has two cores.

https://ark.intel.com/content/www/us/en/ark/products/84993/intel-core-i7-5557u-processor-4m-cache-up-to-3-40-ghz.html

OK. I see what you are talking about. There are some Apple services that will return information about your machine if you supply a portion of your serial number. When I run one of those against the serial number in those images, it does return “MacBook Pro (13-inch, Mid 2009)”.

Also, that screenshot says the machine is running 10.9.5. And the window in the screenshot itself is from 10.9.5. The same view in 10.10+ would look significantly different. That machine is running 10.9.5, which would be impossible on a 2009 machine.

It does appear that your friend was scammed. I am curious about how those values were altered. Could you do a little test for me?

I wrote a little diagnostic program that shows some of these internal values. Download EtreCheck from https://www.etrecheck.com and run it. Create a new reply and use the "Notes" tool below to add your EtreCheck report. Using the link above, you can download EtreCheck from the Mac App Store or download EtreCheckPro directly.

Obviously, you will have to run this on the machine in question. I’m just curious about how this scam was accomplished. There is nothing that we can do about this problem, other that recommend that people only buy their Apple products directly from Apple or an Authorized Apple Reseller. Now, we will be able to use your post as additional support.

Disclaimer: EtreCheck is my own app. EtreCheck is free to use but has in-app purchases available. Downloading EtreCheck or using it could give me some form of compensation, financial or otherwise.

It's impossible to get a Mac to show any specs in System Information than is different from reality. The OS polls the hardware directly to get that information, then displays it.

I bet not. I bet the UI just calls /usr/sbin/system_profiler. You could replace that with a script that calls the real, but renamed, system_profiler and parses the output to replace key system specs. The screenshot, clearly from 10.9.5 shows a number of 2015 specs. But the boot rom is MBP55.00AC.B03.

I played around with it a little bit. Although I can hack the command line system_profiler tool, the System Info info tool doesn’t appear to use that for the machine name, model, and processor. I suppose it could be in a flat file somewhere. Or perhaps someone has hacked the lower-level libraries and are distributing this as a kit to resell old Macs as new ones. Like you, I can’t image that anyone would go through the effort for a single machine. It wouldn’t be worth their time. But it would be a viable idea as a modkit to run this scam at scale.

I have no problem with my service. I have no idea what you are asking about. Please be more specific and provide context.

So, what you're saying is these are the images the ad showed, but what you got was something older?