If your terminal hangs on "waiting for device," your computer cannot see the phone in its bootloader state. Check your Device Manager drivers, swap out your USB cable, or try a different USB port on the back of the PC motherboard rather than the front panel. Stuck in Fastboot Mode
fastboot flash boot boot.img fastboot flash system system.img fastboot flash recovery recovery.img
Ensure you are running the command prompt as administrator (Windows) or that ADB is added to your system PATH. how to open fastboot mode on oppo a37 better
as described in the prerequisites section.
: 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 your terminal hangs on "waiting for device,"
Fastboot Mode (also called Bootloader Mode) is a low‑level protocol on Android devices that allows you to re‑flash system partitions and update firmware directly from a computer. It operates at a deeper level than Recovery Mode. For Oppo A37 users, Fastboot Mode is essential for tasks such as:
Go to Settings > About Phone and tap Version/Build Number 7 times. Then, go to Settings > Additional Settings > Developer Options and enable USB Debugging and OEM Unlocking . Method 1: The Hardware Button Combination (The Fastest Way) as described in the prerequisites section
This is the most common method and does not require a computer. : Completely turn off your OPPO A37.
If your physical buttons aren't working well, you can use a computer to force the device into fastboot mode.