If your model is not updating until you press the space bar on an Android device, there are a few possible reasons why this might be happening:

1. Internal storage: The space bar is a physical button that is used to store data on the device's internal storage. If the space bar is pressed but your model is not being updated, it could be that the space bar is blocking the update process. This could happen if there is a conflict between the update process and the space bar's functionality, such as if the update is a large download that requires a lot of storage space.

2. Data storage location: If your model is storing its data in a location that is not accessible from the space bar, it could be preventing the update process from occurring. For example, if your model is storing its data in a file or directory that is not located in the device's home directory, the space bar will not be able to access it and the update process will not be able to occur.

3. Compatibility issues: If your model is not compatible with the Android operating system version or version number, it may not be able to receive updates that are available on later versions of the operating system. This could happen if the model is outdated and does not meet the minimum requirements for receiving updates.

4. Storage limits: The amount of storage available on the device is also a factor that can impact the update process. If the device has a limited amount of storage space, it may not be able to accommodate a large update, leading to the model not being updated until the space bar is pressed.

To troubleshoot this issue, you can try the following steps:

1. Check the device's internal storage: Go to Settings > Storage > Manage Internal Storage to check the size of the device's internal storage. If there is a lot of free space, it's possible that the space bar is blocking the update process.

2. Check the device's file system: Go to Settings > Storage > Management > File System to check if the update process is taking place on a file system other than the default system partition. If it is, it may be necessary to create a new partition for the update process or mount a new file system that is accessible from the space bar.

3. Update the device's operating system: If the update process is not working due to compatibility issues, try updating the device's operating system to the latest version. This can usually be done by going to Settings > Software Update and following the on-screen prompts to install the latest version.

4. Increase the device's storage space: If the device has a limited amount of storage space, you can try increasing the device's storage space by removing files or directories that you no longer need or installing new applications that require more storage space.

5. Contact the manufacturer or support team: If none of the above steps work, you may need to contact the manufacturer or support team for assistance. They may be able to provide additional troubleshooting steps or help you identify and resolve the underlying issue with the model's update process.