may take up to 10 minutes (Oppo’s ColorOS optimizing apps). Be patient.
Here are some troubleshooting tips to keep in mind: oppo a37m firmware sd card
Flashing or updating your firmware via an SD card is one of the most effective ways to fix software issues like boot loops, "hanging" on the logo, or forgotten passwords without needing a PC. This "Local Update" method uses the device’s built-in Recovery Mode to install a stock ROM package directly from external storage. Essential Preparation may take up to 10 minutes (Oppo’s ColorOS optimizing apps)
Maintain at least 50% charge to prevent the device from powering off during the critical flashing process. "hanging" on the logo