Can't get in macOS Utilities I'm having a problem when I try to get into macOS Utilities. When I hold CMD + R it shows me a prohibited symbol. I'm trying to downgrade my MacBook because its running very slow. Currently I have Mojave installed and I want to donwgrade it to High Sierra.
Before I installed Mojave everything was fine. I could go to the utilities without any problem. it happened after I installed it and can't access the utilities.
About my Mac:
macOS Mojave Version 10.14.6
Macbook (13-inch, Aluminum, Late 2008)
Processor 2 GHz Intel Core 2 Duo
Memory 4 GB 1067 Mhz DDR3
Graphics NVIDIA GeForce 9400M 256 MB
Since Mojave isn't officially supported the recovery partition might be missing.
An alternate way to access the utilities without the CMD+R is to create an install usb. To do this first pick which version you want.

Download image. Downloads can be found at this apple page
Find a 16GB usb flash drive to put the image on (back up all data from it because it will be erased).
Create the usb. You can find the right commands here.
Boot off of the usb by holding down option when pressing the power button.
Access any utilities needed.