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Here's how to Factory Reset iPhone/Android/PS5/PS4/Windows/macOS.

i. To hard reset an Acer Liquid Z5 smartphone:

1. Make sure your phone is turned off. If it's not, hold down the Power button until you get the power off prompt.

2. Hold down three buttons simultaneously - the Volume Up button, the Volume Down button, and the Power button.

3. Keep all three buttons held down for at least 10-15 seconds. Don't release them too soon.

4. Eventually you should see the Acer logo appear on the screen. This means the phone has powered back on into recovery mode. You can release the buttons now.

5. From the Android system recovery screen, use the volume keys to scroll to the option "Wipe data/factory reset" and select it by pressing the Power button.

6. Scroll down to the "Reboot system now" option and select it to restart the phone.

The Acer Liquid Z5 should now reboot, wiped back to factory settings with all previous data and accounts erased. Go through the onboarding process to set up the phone from scratch again.

Be aware that hard resets erase all user data, so be sure to backup anything important first. Also confirm the battery level is charged adequately before beginning a hard reset to avoid the phone shutting down mid-process.

ii. The "eMMC is busy can't format, please retry" error message typically shows up when trying to format the internal storage on certain Android devices.

The eMMC stands for Embedded Multi-Media Controller. It is the component in a device that handles the internal, non-removable flash storage.

This error occurs when the eMMC chip is temporarily unavailable to take requests to format the storage. This can happen for a few reasons:

1. The eMMC is currently being accessed for another operation like reading, writing, or erasing data. Formatting typically needs exclusive access.

2. There may be a background service/process that is actively using storage access channels to the eMMC. This can block formatting requests.

3. If the eMMC storage is corrupt or damaged in some way, it can cause interference as well.

The "please retry" portion of the message implies that formatting should be possible once the eMMC chip is no longer busy.

To resolve, you can try the following:

- Wait a few minutes and retry formatting. See if any background processes complete.

- Boot into safe mode and try formatting. This prevents non-critical processes from running.

- Try a factory reset then format again. This wipes temporary software issues.

- If nothing works, there may be deeper hardware issues with the eMMC requiring professional service.

So in summary, it's an availability issue with the storage hardware that should be resolvable by following some troubleshooting steps to remove blocking processes/issues. Retrying later is the first step.