If the mobile phone and accessories fail to recover by themselves, you can send the mobile phone to the nearest OPPO customer service center, and the professional engineer will detect and handle it for you.
If you are far away from OPPO customer service center, you can also choose convenient maintenance methods such as on-site maintenance or mailing service (two-way free mailing). Service outlets can be inquired/service center/
Note: This answer is applicable to all models of OPPO.