Entering Fastboot is safe, but executing commands while in this mode (like flashing unlock ) can and may void your warranty . Always back up your important files before proceeding with system modifications. If you'd like more help, let me know:
Oppo devices use the "Update System Mode" as a gateway. Fastboot is nested inside this recovery-like menu, not directly accessible from a powered-off state. how+to+open+fastboot+mode+on+oppo+a74+best
To determine the way for you , evaluate your current situation: Entering Fastboot is safe, but executing commands while
Common tasks on Oppo A74: