: Advanced service tools specifically optimized for MediaTek chipsets like the one inside the OPPO A37. They can force Fastboot/Bootloader mode even from a bootloop state. How to Verify Fastboot Connection on Your PC
If the command doesn't work, alternatives include adb reboot fastboot or adb reboot bootloader --force . how to open fastboot mode on oppo a37 better
: Press and hold the Volume Up and Power buttons simultaneously for a few seconds. : Advanced service tools specifically optimized for MediaTek