: Plug your phone into your computer via a USB cable.
If your physical buttons are not working correctly, you can trigger the mode using a computer. : how to open fastboot mode on oppo a37 better
But for the Oppo A37, there was a cleaner path. He connected the device to his laptop. With a flick of his fingers across the mechanical keyboard, he typed the incantation into the terminal: adb reboot bootloader : Plug your phone into your computer via a USB cable
Here's a step-by-step guide to access fastboot mode on Oppo A37: how to open fastboot mode on oppo a37 better