You may see the OPPO logo appear; continue holding until the Fastboot interface shows on the screen.
Once the screen is completely black, press and hold the Power button and Volume Up simultaneously for a few seconds.
Go to Settings > About Phone > Version and tap Build Number 7 times. Enable USB Debugging: how to open fastboot mode on oppo a58
This is the actual process to switch the phone into Fastboot Mode.
Download and install the latest or OPPO MediaTek Drivers on your computer. Stuck in a Fastboot loop System files or the boot partition might be corrupted. You may see the OPPO logo appear; continue
Q: Can I enter Fastboot mode on Oppo A58 without a computer? A: No, you need a computer with a USB port to enter Fastboot mode on Oppo A58.
Your phone will boot into a language selection screen (usually starting with English). Enable USB Debugging: This is the actual process
This is the standard way to enter the mode directly from the device: the device completely.
Your Oppo A58 will immediately shut down its standard OS interface and boot directly into Fastboot mode. How to Exit Fastboot Mode
Ensure your Oppo A58 has at least 50% battery to prevent it from dying during critical operations.