The phone was bought for 3 or 4 months, and recently it suddenly appeared at the wrong time.

Hello! We apologize for the inconvenience, but we recommend that you follow the following methods in order to solve your problem.

This item will lose all the data stored by the user on the mobile phone, including ** book, short message, third-party application software, and related information, and the data stored on the T card will not be lost. Use with caution.

Instructions for firmware upgrades.

If the problem cannot be solved through the above methods, please contact the after-sales service center, and the address of the after-sales service center can be found in the settings - general more settings - after-sales service menu. You can also go to vivo official ** to check the address of the after-sales service center.

The hardware in the phone is broken.

7 days no reason to return or exchange.

If you purchase a mobile phone from an official or officially authorized store on the shopping platform, from 0:00 on the next day of receipt (the 7-day period starts from 0:00 on the next day after the buyer signs for the goods, 168 hours is 7 days, and the time for the buyer to sign for the goods is subject to the logistics signature time), in accordance with the requirements of the "Consumer Law" and the "Interim Measures for Seven-day No Reason Return of Goods Purchased Online", you will be provided with no reason to return and exchange the goods within 7 days.

The OPPO phone is necessary to enjoy the no-reason return service within 7 days: the returned phone is not activated and is intact;

The phone needs to be tested by the OPPO customer service center to confirm that the product is not activated and intact before it can be returned or exchanged.

Explanation of the situation that no return or exchange will be processed for 7 days without reason:

Activated OPPO phones do not support the seven-day no-reason return service (after the SIM card is installed and connected to the data or WiFi network, the e-insurance card will be activated and registered);

The returned mobile phone serial number does not match the outbound serial number;

Unauthorized disassembly, maintenance, misuse, collision, liquid ingress, accidents, flashing and incorrect installation caused by product quality problems, or tearing or altering labels, mobile phone serial numbers, network access permits, etc.;

The original packaging of the mobile phone is incomplete, and the standard accessories are incomplete;

The gift given with the order cannot be returned in full, and the gift packaging is incomplete (except where the consumer agrees to pay the price of the gift);

At the time of purchase, the page clearly states that items cannot be returned or exchanged.

Mobile phone products that do not meet the conditions for return and exchange without reason within seven days will be followed up and dealt with according to the national three-guarantee policy, and users should go to the local customer service center for processing.

7 days for return and exchange, 30 days for exchange.

From the date of purchase, within seven days of the host product appears in the "mobile machine performance failure table" listed in the performance failure, in the case of mobile phone packaging, accessories and valid proof of purchase, according to the user's wishes can enjoy return or free replacement service, after the replacement of the new host product three guarantees of validity from the date of replacement recalculation. If the fault described by the user is not repeated at the time of the first acceptance within seven days, if the same fault is repeated within seven days after the first acceptance, the validity period of the return and exchange shall be subject to the time of the first acceptance.

From the date of purchase, within 30 days of the host product appears in the "mobile machine commodity performance failure table" listed performance failure, in the case of mobile phone packaging, accessories and valid proof of purchase, according to the user's wishes can enjoy free replacement service, after the replacement of the new host product three guarantees validity period from the date of replacement recalculation; If the fault described by the user is not repeated at the time of the first acceptance within 30 days, if the same fault is repeated within 30 days after the first acceptance, the validity period of the replacement is subject to the time of the first acceptance.

Mobile phone tablet return conditions:

1.Within 7 days from the date of sale of mobile phones and tablets, if there is a performance failure, consumers can choose to return, exchange or repair; When consumers choose to return or exchange goods, they must provide relevant three-guarantee certificates before they can handle it, and the maintenance station will issue a test sheet and contact the dealer for return and replacement business.

2.Mobile phones and tablets from the 8th to the 15th day from the date of sale, if there is a performance failure, the consumer can choose to replace or repair; When consumers choose to exchange goods, they must provide relevant three-guarantee certificates before they can handle it, and the maintenance station will issue a test sheet and contact the dealer for replacement business.

This phenomenon is due to the failure of one component of the circuit board, it is recommended to contact the after-sales maintenance, otherwise it is very dangerous.

Hi! Dear, it is recommended to clear the data three times, shut down - volume up button and press the power button at the same time - recovery mode - clear data - clear all data.

No way, flash the machine, restore the factory.

There are two ways to set the time: automatic update and manual adjustment.