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OPPO A37T TESTED FIRMWARE FREE
HANG ON LOGO DONE
RESTART PROBLEM FIX
GOOGLE PLAY FIX
UNTICK PRELOADER
THEN FLASH
FIRMWARE NAME
Oppo_A37T_EX_11_D.03_170516
Oppo A37T flashing Mtk

Flashing a device's firmware refers to the process of updating or replacing the software on the device. In the case of the Oppo A37T, which is a MediaTek (MTK) based device, you will need to use a tool called SP Flash Tool to flash the firmware onto the device.
Here's a general overview of the process:

Download the firmware for your specific Oppo A37T model from the official Oppo website or from a reputable third-party website. Make sure that you download the correct firmware version for your device, as using the wrong firmware could cause serious problems.

Download and install SP Flash Tool on your computer. This is a free software that is used to flash firmware onto MediaTek-based devices.

Open SP Flash Tool and load the firmware that you downloaded in step 1.

Connect your Oppo A37T to your computer using a USB cable. Make sure that the device is in "Download Mode" or "Firmware Upgrade Mode" in order for SP Flash Tool to detect it.

Select the options in SP Flash Tool that correspond to the firmware that you loaded. Typically, you will want to select "Download Only" and "Firmware Upgrade" under the "Download" tab.

Click on the "Download" button to begin the flashing process. Wait for the process to complete.

Once the process is finished, your Oppo A37T should reboot and the new firmware will be installed.

Please note that flashing firmware will wipe all user data and installed apps on your device. So it is very important to make sure to backup your important data before doing the process. Also, flashing firmware can also be a complex and risky task, so it's important to understand the process and to proceed with caution.
It is also highly recommended to follow the instructions from the manufacturer or a reliable guide to avoid any unwanted consequences such as brick your device.