During AR upgrade, the memory space is insufficient

Root cause:
When you use the delete command to delete the file, the file is not directly deleted from the storage medium. Instead, the file is moved to the recycle bin and still occupies the memory space.
If the remaining storage space is smaller than the size of the file to be copied during the upgrade, check the directories of the storage, delete useless files, and clear the recycle bin to enlarge the memory space. If the space is insufficient, you can press Ctrl+B to enter the BootLoad menu, delete the existing version, copy the new version, and upgrade the device. In this way, you can solve the problem of insufficient memory space.

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