Hello, 1. For installation pop-up prompts such as installation parsing failure and no signature, part of the reason is that the download package data is lost and damaged, and the connection between the current network and the upgrade server is unstable. Downloading system updates Packets are occasionally lost, and update package verification fails. Please re-download the system update package and install it. If the network is always poor, it is recommended to change the download time or change the network for downloading.

2. For installation pop-up prompts when the SD card has insufficient space or prompts that there is no SD card or access to the SD card fails:

1) Confirm whether the default storage is external storage and change it to internal storage.

2) Replace the memory card.

3. The above method is invalid. It is recommended that you restore factory settings.