How to completely delete chat history on Oppo phone and cannot recover it?

If your OPPO phone needs to be restored to factory settings (here, we take the OPPORenoAce phone CoIorOS11.1 version as an example). You can follow the following path: Enter the phone's "Settings; Other Settings; Restore Phone", and clear the corresponding content according to the phone prompts. (If the phone has a lock screen password set, you need to enter the lock screen password to verify the phone data before clearing the phone data. If you forget the password, please back up important data on the phone and bring the purchase voucher to the local OPPO customer service center for processing) ① Restore Wireless settings: Restore WLAN, Bluetooth and mobile data networks only. ②Restore system setting items only: Restore only system setting items (all system setting items in settings). ③Clear downloaded applications and application data: Clear your downloaded applications and application data (keep music, photos and other data). ④ Completely clear all data: Clear all data in the phone (including photos and music) and restore system settings. ⑤Clear mobile phone contacts and call records: Only clear mobile phone contacts and call records, SIM card contacts will be retained. ⑥Clear SMS and MMS: Only clear SMS and MMS, SIM card SMS will be retained. Warm reminder: ①_Children's dice refers to breaking into the niche_White ⒁ wild 蜜蔔 only waiting for forgiveness ⒍绦twist ⒄ Zhangtuo τ rose blade edge _芊庵 plaque persimmon gap А＂谌裟ba type ü dry pomelo, low into pomelo ㄆ渌 Pomelo Mang_碁缜霭譭ㄒTiredū霜牖 Refers to chu_structure δ鼙霜蹨耨愿ㄒBingshan Mishixia Award Blowing Fermentation An Mowa⒒fly缒 Disaster Salary Incline 4妗R_PPO Mobile System Version The operation path may be slightly different, please refer to the actual operation interface of the mobile phone. This answer applies to all OPPO models.