[Bikodino]

I'm sorry.
but I'm forced to learn how to upload a shell .... is a basic thing!
possible that nobody knows?

[Faner]

You know, protection is created to stop ones like you. So if few professional security developers stable and reliable upload system, you won't manage to bypass restrictions. In that case you must find other means of shelling that website. Bypassing upload restrictions is really not the most basic thing about hacking. Uploading a shell through build in system isn't the only way of getting access to website...

[Linuxephus™]

You know, protection is created to stop ones like you. So if few professional security developers stable and reliable upload system, you won't manage to bypass restrictions. In that case you must find other means of shelling that website. Bypassing upload restrictions is really not the most basic thing about hacking. Uploading a shell through build in system isn't the only way of getting access to website...

Agreed.
Hence some techniques that require a more "out of the box line of thought" as stated by 1llusion.
Everything, no matter the objective, has a vulnerability at some point in time somewhere.
When you reach a scenario where a well known method fails to produce the desired result, it's time to take full stock of the current situation and assess all available options and then tailor a suitable option to the given problem at hand.
Think of this along the lines of: A plan or applied technique is only as good as it's ability to adapt to the changing circumstances.
Or water that is able to conform itself to any shape.
This is the line your thoughts should take to better apply what you're seeking in those regards.

[0zie]

some site can bypass php using x.php.jpg, but some site with good security will not work with this way.