When a phone experiences a spike in temperature immediately after upgrading its operating system (such as moving from ColorOS 13 to ColorOS 14 or 15), the root cause is almost always , rather than broken hardware.

The OPPO A78 4G (Model CPH2565) Go to product viewer dialog for this item.

This signals a corrupted firmware package download or a bad USB connection. Try a different USB port, replace the data cable, and re-extract the firmware zip file.

Linh checked the new firmware. The hot partition had been entirely rewritten. The HOT_BOOST_ACTIVE function was gone. Y.C.’s comments were scrubbed.

Using maximum brightness, 4G/5G, and high-performance modes simultaneously.

If you recently installed an OTA update, the system requires a low-power maintenance cycle to settle down. Charge the device to .

OPPO A78 4G Overheating Fix: Ultimate Firmware & Software Troubleshooting Guide

: If ColorOS 14 is causing persistent overheating, you can visit an Official OPPO Service Center to have the device downgraded to ColorOS 13 .

A junior firmware engineer at an Oppo service center discovers that a corrupted “Hot” thermal management module in the Oppo A78 4G is not a bug, but a silent weapon designed to destroy the phone from the inside out—and the countdown has already begun for millions of devices.

Below the comment, a function:

The standard stable versions for the OPPO A78 4G typically follow the CPH2565_13.1.1 branch before upgrading to Android 14. OPPO Global Community Android Version: Upgradable to Android 14. Major Build Number: CPH2565_13.1.1.582(EX01) or similar.

If the device gets hot while charging with the 67W SuperVOOC adapter, this is generally normal behavior. However:

Disconnect your phone and hold the Power button to reboot it. The first boot may take up to 10 minutes as the system sets up the new user data cache. Troubleshooting Common Flashing Errors