Those "solutions" are scams.
Unless you have the original receipt or the person you purchased from can remove the activation lock, it's a paperweight as activation lock is controlled via Apple servers: the machine phones home to get a certificate to permit booting of the machine.
Learn what to do if you see the Activation Lock screen on your device, or if you're asked to remove Activation Lock on a device that's offline and not in your possession.
support.apple.com
Activation Lock makes it difficult for someone else to use or sell an iPhone, iPad, Mac, or Apple Watch.
support.apple.com
And, in general, it is frowned upon to ask for help on how to bypass security of iffy devices on this site.