: Go to Settings > About Phone and tap on Build Number 7 times until you see "You are now a developer".
To return to normal operation, press and hold the for about 10–15 seconds until the device vibrates and restarts normally. Alternatively, if you are using a PC, you can enter the command fastboot reboot . how to open fastboot mode on oppo a37 verified
: Release both buttons once the "Fastboot" text or logo appears on the screen. : Go to Settings > About Phone and
Your phone will simply reboot normally. This confirms that Fastboot is disabled or removed by Oppo on your A37. : Release both buttons once the "Fastboot" text
Unlike modern flagship phones that have streamlined or even removed Fastboot in favor of GUI-based recovery options, the Oppo A37 (running on the older ColorOS versions based on Android Lollipop/Marshmallow) retains the traditional Fastboot environment. While accessing it is theoretically simple, the hardware limitations of the A37—specifically its aging volume buttons—often make the process tricky.