1. Incompatible upgrade file: As the current version of the early education machine is not compatible with the version to be upgraded, it is recommended to read the upgrade instructions carefully before upgrading, and confirm the model of the early education machine and the version that can be upgraded.

2. Network problem: If you need to download the upgrade file from the network, and the current network environment is unstable or the network connection is unreliable, the upgrade will fail. Please check whether the network connection is normal, or try another network environment and try again.