Based on updated data for 2026, here are the most relevant and functional codes for the Oppo A9 2020: 1. Device Information & Diagnostics
✅ Most reliable after ColorOS update: (Oppo's own hardware test menu)
: Be careful with "Factory Reset" codes like *#8778# , as they may instantly delete your data without a second warning. Activating Developer Options If you need deeper system tweaks beyond secret codes: Go to Settings > About Phone > Version .
*#*#3649546#*#* Used to enable Full Throughput Analysis for network engineers. It shows signal strength (RSRP, RSRQ) and band info (LTE band 1,3,5, etc.). Useful in areas with poor reception. how to use secret codes on oppo a9 2020 upd
After a major update (e.g., ColorOS 6 to 11), OPPO may disable certain codes for security. If a code fails:
You can use secret codes on your by typing them directly into the built-in Phone dialer app .
Displays detailed firmware info, including Android version, ColorOS version, and kernel details. *#06# Based on updated data for 2026, here are
Accesses the built-in feedback and log menu to report issues directly to Oppo. *#*#4636#*#*
While standard battery menus hide state-of-health data, entering the engineering portal lets you check raw battery voltage and charge temperature. This helps you determine if a fast-draining battery stems from a hardware chemical decline or from background software processes. ⚠️ Safety Precautions and Update Notice Oppo A9 2020 updates
If you are locked out of your phone, note that does not work on modern ColorOS; you must use Recovery Mode (Power + Volume Down) to wipe data, as described in this YouTube guide . Final Tips *#*#3649546#*#* Used to enable Full Throughput Analysis for
Ultimate Guide: How to Use Secret Codes on Oppo A9 2020 (Updated)
Using these codes will erase all data on your device, including apps, photos, and messages.
*#899# – Remember it, bookmark it, use it monthly to monitor your phone's health.
Shows the Specific Absorption Rate (SAR) level, indicating the amount of radio frequency energy absorbed by your body. (Hardware Revision):