Dial *#*#6776#*#* to open the "Feature Phone" test menu. Here, you can view your exact firmware build date, bootloader version, and—most importantly—the thermal threshold table. If your phone feels sluggish, check if "Thermal Level" shows "3" or higher.
In firmware A.12 and A.13, a bug causes the modem to stay active when Ultra Power Saving Mode is turned off. The phone searches for a weak 4G signal continuously, generating heat.
Fix:
If your phone is already hot and lagging, an OTA update over a corrupted system may not fix the issue. You need to reflash the full firmware package using OPPO’s local update tool.
Steps:
Warning: This does not erase personal data, but always backup.
Whether your Oppo A78 is physically hot to the touch, or you are looking for the "hot" file to fix a soft-bricked device, using the correct firmware is critical.
Got questions? Drop a comment below if your device gets stuck at 0% or if you encounter a DA validation error during flashing!
Disclaimer: Flashing firmware carries risks. Ensure your battery is above 30% before proceeding. We are not responsible for bricked devices.
launched with Android 12 (ColorOS 13) and was officially eligible for two major OS updates Current Version : The device has already received ColorOS 14 (Android 14) Android 15 : Current reports indicate the not eligible
for the ColorOS 15 / Android 15 update, though it will continue to receive security patches. Fixing Overheating ("Hot") Issues
Many users have reported that the device runs hot or lags significantly after updating to ColorOS 14. If your phone is overheating, try these steps: Post-Update Optimization
: After a major update, the system performs background optimizations that cause temporary heat. Recommendation
: Turn off the screen and charge the device overnight after a successful update to let these processes complete. Disable RAM Expansion firmware oppo a78 4g hot
: This feature uses internal storage as virtual RAM, which can increase heat if storage is nearly full. Disable it via Settings > About device > RAM Manage Background Apps
: High processor usage from too many active apps often leads to overheating. Close unused apps and check Settings > Battery to find power-hungry processes. Avoid Usage While Charging
: Using the phone for gaming or video streaming during fast charging is a primary cause of overheating. Downgrade Firmware
: If the heat is "scalding" and performance remains poor after weeks of use, some users have opted to visit an official OPPO Service Center to downgrade back to ColorOS 13 for stability. How to Update or Reinstall Firmware You can manage your firmware through official channels:
OPPO A78 4G (model CPH2565) has officially transitioned to Android 14 with ColorOS 14
, a major update that brings refined animations and system optimizations. While some regions are seeing recruitment for ColorOS 15 , it is important to note that the device may experience temporary heating issues
immediately after a major firmware installation due to background system optimization OPPO Global Community Latest Firmware Overview
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.
Official stable versions are widely available, though released in batches by region. OPPO Global Community Managing Post-Update "Hot" Issues
It is normal for the OPPO A78 4G to feel hot or experience battery drain for 2–3 days following a firmware update. To mitigate this: OPPO Global Community Charge Overnight:
After the update, keep the device on a charger with the screen off for a full night to allow the system to complete background optimization. Update Apps:
Ensure all third-party applications are updated via the Play Store, as older versions may cause crashes or overheating on newer Android firmware. OPPO Global Community How to Check and Install Updates
The safest way to get the latest "hot" or trending firmware is through the official system settings: Navigate to About device Tap the top banner to check for updates. If a trial or official version is available, select the three-dot icon (top right) > Trial versions Official version Alternatively, use the official OPPO System Upgrade Tool on a PC for a more stable wired update experience. OPPO Global Community Advanced Flashing (Stock Firmware) Dial *#*#6776#*#* to open the "Feature Phone" test menu
For users looking to "flash" or fix a bricked device, stock ROM files are typically available through professional databases like GSM Hosting Files Requires specialized tools like the Unlock Tool SP Flash Tool (if using MediaTek firmware).
The OPPO A78 4G Go to product viewer dialog for this item. (model CPH2565) originally launched with ColorOS 13.1 based on Android 13. While there is no official firmware specifically branded as "hot," users often refer to "hot" firmware in the context of recent ColorOS 14 (Android 14) updates that can cause significant device heating during the initial optimization phase. Software & Firmware Overview
Operating System: The device debuted with ColorOS 13.1. Most regions have since received updates to ColorOS 14 (Android 14) and are eligible for ColorOS 15.
Firmware Issues ("Hot" & Lag): After installing major updates like Android 14, the system performs background optimizations that may lead to temporary heating, lagging, and fast battery drain. Official advice recommends leaving the device to charge overnight after an update to let these processes complete.
Bloatware: A consistent complaint in reviews is the "jaw-dropping" amount of pre-installed apps and "Hot Apps/Games" folders, which can be cluttered and intrusive. Oppo A78 4G Full Review: BEST Budget Phone??….
: After a major update, the phone may run warm for 24–48 hours while it re-indexes files. Leave it on a charger overnight to let the system finish these background tasks. 2. Use the Built-in Diagnostic Tools
You can check if a specific hardware component is causing the heat using hidden menus: Engineer Mode
to access the factory test menu. Here, you can monitor real-time battery temperature and hardware status. Phone Manager : Open the pre-installed Phone Manager app and tap
. This will clear system cache and close "rogue" apps that are overworking the processor. 3. Cooling & Performance Tips
If the phone stays hot, try these manual steps to reduce the load on the firmware: Clear App Cache : Long-press heavy apps (like games or social media) > Storage Usage Clear Cache Limit Background Apps App Management and force-stop apps you rarely use. Remove "Hot" Features
: If you use a very thick case, remove it during heavy use to help the back panel dissipate heat. 4. Advanced Firmware Maintenance
For persistent software glitches like boot loops or extreme lag after an update: Safe Format
: If the phone is malfunctioning after a firmware change, technicians often use tools like the If your phone is already hot and lagging,
to perform a "Safe Format + FRP" reset, though this should be a last resort as it wipes your data. : If your phone is physically hot to the touch while
If your OPPO A78 4G (model CPH2565) is running hot, this is often a temporary side effect of a recent system update (like Android 14/15) while the OS optimizes in the background.
Follow this guide to manage the heat or reinstall firmware if the issue persists. 1. Immediate Cooling & Stabilization
Before flashing new firmware, try these steps to allow the system to stabilize after an update:
Post-Update Rest: After updating, turn off the screen and charge the phone for at least 2 hours or overnight. This allows the OS to complete automatic background optimizations.
Identify Power Drains: Go to Settings > Battery to check which apps are consuming the most power and restrict their background activity.
Disable RAM Expansion: Navigate to Settings > About Device > RAM and turn off the RAM expansion feature, as it can sometimes increase system stress and heat.
Update Apps: Ensure all apps are updated via the Google Play Store to prevent compatibility-related overheating. 2. Updating via Official Tools
If you need to refresh the system software to fix bugs, use the official methods:
OTA Update: Go to Settings > About Device > ColorOS to check for the latest stable version.
ColorOS Assistant (PC): For a more stable installation, download the OPPO System Upgrade Tool on a Windows 10+ PC, connect your phone, and follow the on-screen prompts. 3. Hard Reset (Clean Slate)
If the overheating persists, a factory reset can clear corrupt temporary files: [Official version / IN] OPPO A78 Android 14 x ColorOS 14
To manually force your phone to cool down: Dial *#*#3646633#*#* (if not disabled by carrier). Navigate to HW -> Thermal. You can temporarily relax the thermal limits—but do this only if you're a tinkerer. You will burn your hand and degrade the battery.
If these don’t help, proceed to flashing.