Popular third-party tools mentioned in the community include the UnlockTool (paid/professional) or various "All-in-One" MTK (MediaTek) and Qualcomm flash tools.
While blogs often advertise "one-click" free tools, the process usually involves one of the following technical approaches: oppo-vivo-demo-mode-remove-tool-free-download-my-blog
Downloading "free tools" from unverified blogs carries significant risks: Popular third-party tools mentioned in the community include
Older models sometimes allowed removal via secret codes (e.g., *#36446337# or *#*#3646633#*#* ) entered into the emergency dialer. oppo-vivo-demo-mode-remove-tool-free-download-my-blog