It is known that Recovery mode is used to unlock Android smartphones in case you forgot your pattern.
If the firmware on the smartphone was changed to an unofficial one, then it is quite possible that the Recovery partition could have been erased, and it would not work to enter it. Also, this mode may not be in fakes, mowing under Samsung, iPhone.
These are very old devices from 2013-2014 based on Allwinner or Rokchip processors, but there are few of them and they are outdated.
Also, the recovery cannot be called on most Chinese fakes for Samsung and iphone on the MTK processor (on some you can enter the recovery, but the control does not work), but again there are not so many of them and they are categorically bad.
There is also no recovery in some Xiaomi devices, but there is a native utility for the computer for resetting.
There are also devices from Meizu and, for example, OnePlus, you cannot reset them, because even in recovery, he will ask for the same password and graphic key, that is, you cannot reset the password.
Also, on some devices with an unlocked bootloader, for example, on the MTK processor, software recovery is damaged and it will not go there again until it flash through the flash tool