The software downloaded from the application market cannot be installed or updated.
1. If the installation resolution fails or there is no signature, the pop-up prompt is displayed. Some of them are the loss of download packet data, and the connection between the current network and the upgrade server is unstable. When the system update package is downloaded, some packets are lost, and the update package check fails. Download the system update package again. If the network quality is poor all the time, it is recommended that you change the download time or the network.
2. If the space of the sd card is insufficient, or the system prompts that there is no sd card, or the access of the Sd card fails, the installation dialog box is displayed:
1) Check whether the default storage is external storage and is changed to internal storage.
2) Replace the memory card.
3. The above method is invalid. It is recommended that you restore the factory settings.
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