How To Open Fastboot Mode On Oppo A37 Verified |link|
The most reliable method to enter Fastboot Mode on the Oppo A37 involves a specific sequence of physical button presses. This method is verified for the standard ColorOS software that ships with the device.
Go to → Turn on USB debugging .
This is the verified method developers use to flash TWRP and custom ROMs on the Oppo A37. how to open fastboot mode on oppo a37 verified