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APP version update fails.
APP version update fails.
1. Make sure the network is normal. Note whether the APP download fails or the APP installation fails.
2. If the download fails, try changing the network.
3. If the installation fails, uninstall the old version before updating to the new one.
2. If the download fails, try changing the network.
3. If the installation fails, uninstall the old version before updating to the new one.