Oppo A20 1 has been bought for more than a year, but it can't be saved recently.

Hello! There are three possibilities for this situation:

1. There are too many short messages stored in the mobile phone or the short messages are full; 2. The memory of the mobile phone body is insufficient; 3, mobile phone system problems (this possibility is very small).

Solution: Please delete some or all of the short messages and try again. If it has not been solved, it is recommended to format the local memory of the mobile phone. The steps to format the phone memory are: main menu → file management → settings → formatting → phone (remember to select the phone here) → and then confirm.

Note: If there is important data in the phone memory, please copy and back up the data to the memory card before formatting the phone memory to avoid data loss after formatting.

If the above methods can't be solved, it may be a problem with the mobile phone system. It is recommended to take time to go to the OPPO after-sales service center to refresh the phone firmware.

Note: Please back up the important information of "phone book, SMS, etc." on your mobile phone, because the information on your mobile phone will be emptied after you swipe it (except the information on the memory card). If you can't back it up, you can also ask the after-sales technicians to help you back it up.

The address and telephone number of the OPPO after-sales service center can be found in the service column of OPPO official website. Official website address: www.oppo.com.

I hope I can help you!