How To Use Secret Codes On Oppo A9 2020 Upd Hot! Jun 2026

user wants a long article on how to use secret codes on the Oppo A9 2020 (updated version). I need to cover what secret codes are, a list of common codes, how to use them on an updated Oppo A9 2020, and safety warnings. The date is May 28, 2026, so I need to ensure the information is up-to-date. I'll search for relevant information. search results provide some initial codes. I need to gather more comprehensive information. I'll open the top results for more details. have gathered information from multiple sources. I'll organize the article with sections on: introduction, what are secret codes, how to use them (step-by-step), category-wise list of codes (including device info, hardware testing, network, reset/wipe, service and engineering modes, Android testing menu), troubleshooting why a code isn't working, important warnings and safety tips, and a conclusion. The article will be long and detailed, as requested. I'll cite the sources. Now I'll write the article.Disclaimer**: This guide is for informational purposes only. Using secret codes, especially those involving resets or system modifications, carries inherent risks. Proceed with caution and at your own discretion.

*#899# - Opens the main diagnostic menu for manual hardware tests.

Before you dive into exploring these codes, take a few minutes to back up your phone and read about each code’s function. Stick to informational codes unless you are confident in your technical knowledge. When used correctly, these hidden menus give you unprecedented visibility into your device’s health and performance—and can save you a trip to the service center for simple hardware checks.

The great news for Oppo A9 2020 owners is that this phone runs on Android 9 (Pie) and ColorOS 6.0.1, an operating system version that predates some of the manufacturer restrictions applied to newer models [6†L5]. Because of this, you'll likely find that most of the codes in this guide will work perfectly on your device [9†L31-L32].

, including those relevant to troubleshooting or updating the device. 1. What Are Secret Codes and How Do They Work? how to use secret codes on oppo a9 2020 upd

To use secret codes on your OPPO A9 2020 Go to product viewer dialog for this item.

: Displays the Specific Absorption Rate (radiation level) for your specific model. Specific Hardware Diagnostic Codes

This code prompts a total factory reset (wipe all data, logs, settings). Unlike the Settings menu, this does not ask for a password if the screen is unlocked.

Use apps like "Secret Codes" from the Play Store, which often scan for all available codes on your specific Android version. user wants a long article on how to

: Provides hidden statistics for your Wi-Fi , Network , and Battery usage .

: View the PCB (mainboard) serial number and hardware version.

Displays detailed network and battery statistics, usage history, and Wi-Fi information.

Open the default app (the green dialer icon). Do not use Google Dialer if you changed defaults. I'll search for relevant information

Use this to check your exact ColorOS version, Android version, and kernel details. Network Unlock ( *#3988691#

*#808# - Opens the manual hardware test interface.

In the menu, swipe over to the Device Debugging tab. Select Sensor Self-test and Calibration . Place the phone on a flat, level surface.

That's it. You're now ready to explore the hidden side of your phone.

This is the most critical code for Oppo users. It opens the built-in Engineer Mode diagnostic menu. From here, you can manually or automatically test every hardware component on your device, including the screen, cameras, sensors, GPS, and vibration motor. 2. IMEI Identification Code: *#06#