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Answer: Hello! You can consider changing your mobile phone! Generally, the battery life of mobile phones is only 3 or 4 years. In your case, the battery life of mobile phones should be expired! So I don't recommend you to repair or replace the battery! Back up important data directly and change your phone!
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Answer: OPPO R821T has been out of production for a long time, and the official has stopped pushing updates for a long time, so it needs to refresh the system itself.
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Answer: If you can't use it, it is recommended that you test the headset on other devices. If there is still no problem, the only reason is that the headset standard is different. Although the current 3.5mm connector, the audio standard is different. You can try to rotate and pull out a section of the connector to try.
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Answer: This situation may be caused by system failure. You can press and hold the power key+volume up key to enter the recovery mode when the machine is turned off, select wipe date/factory reset to clear data and restore factory settings, and wipe cache partition to clear the number of caches
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Answer: Hello! I guess the water in your motherboard is not completely dry. Did the technician who repaired your mobile phone wash your motherboard and then bake it completely for you? I think the water in the WiFi module is not completely dry, which leads to a short circuit. I suggest you put
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Answer: Check whether the only 4G/5G option is selected for the phone's network settings. Sometimes switching to 3G mode is faster
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Answer: Isn't this an Android phone? You don't need to convert it to avi format. You can download the flash or MX PLAYER directly
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Answer: Hello, landlord! I suggest you still use the official ROM package! Don't brush other models. It's unscientific. You should brush the firmware corresponding to your mobile phone. You can't brush other models. Otherwise, it's easy to crash, black screen, system paralysis, etc., and can't be used normally. Firmware
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Answer: 1: Download the QQ space client directly for uploading (this is the simplest and fastest, but it requires your mobile phone to be a smart phone). 2: Upload with QQ browser and UC, enter QQ space first → _ → space homepage → _ → photo album → _ → view pictures → _ → select pictures to upload