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Here's how to Fix Error performing request Unknown Error on iPhone.

i. Some of the common causes of the iPhone not downloading pictures problem are:

- The iPhone is not connected to a stable network or has a low cellular data limit.
- The iCloud Photos settings are not configured properly or the iCloud storage is full.
- The photos are deleted or corrupted on iCloud or the device.
- The iOS software is outdated or has a bug.

Here are some steps you can follow to fix the issue:

1. **Check your network connection** and make sure your iPhone is connected to a Wi-Fi or cellular network that is fast and reliable. You can also try switching to a different network or turning on Airplane Mode and then turning it off again. If you are using cellular data, make sure you have enough data allowance and that Cellular Data is turned on for Photos in Settings - Cellular.
2. **Check your iCloud Photos settings** and make sure they are configured correctly. Go to Settings - [your name] - iCloud - Photos and turn on iCloud Photos. Then, choose Download and Keep Originals to download all your photos from iCloud to your device, or choose Optimize iPhone Storage to save space on your device. You can also check your iCloud storage and free up some space if it is full.
3. **Check your photos on iCloud and your device** and make sure they are not deleted or corrupted. You can go to iCloud.com on a web browser and sign in with your Apple ID. Then, click Photos and look for the photos you want to download. If they are not there, check the Recently Deleted album and see if you can recover them. You can also check your photos on your device by opening the Photos app and looking for the photos in the Recents or Recently Deleted albums².
4. **Update your iOS software** and make sure you have the latest version of iOS on your device. Go to Settings - General - Software Update and check for any available updates. If there is an update, tap Download and Install and follow the onscreen instructions.

ii. There are a few reasons why your iPhone might not be receiving picture messages. Here are some troubleshooting steps you can try:

1. **Make sure that you have a cellular data plan that supports MMS.** MMS messages are sent over cellular data, so you will need a plan that includes MMS messaging.
2. **Check your iPhone's settings.** Make sure that MMS messaging is enabled. You can do this by going to **Settings** - **Messages** - **MMS Messaging** and making sure that the toggle is turned on.
3. **Restart your iPhone.** Sometimes, a simple restart can fix problems with MMS messaging.
4. **Reset your network settings.** This will reset all of your network settings, including your MMS settings. To do this, go to **Settings** - **General** - **Reset** - **Reset Network Settings** and enter your passcode when prompted.
5. **Contact your carrier.** If you have tried all of the above steps and you are still not receiving picture messages, you may need to contact your carrier for help.

Here are some additional things to check:

* **Make sure that you are connected to a cellular network.** If you are connected to Wi-Fi, you will not be able to receive MMS messages.
* **Make sure that you have enough storage space on your iPhone.** MMS messages can be large, so you will need enough storage space to receive them.
* **Make sure that the person who is sending you the picture message has their MMS messaging enabled.** If the person who is sending you the picture message does not have their MMS messaging enabled, you will not be able to receive the message.

iii. Error 4013 is an iOS system issue that occurs when an iPhone restore or update is interrupted. This can happen for a variety of reasons, such as a power outage, a USB cable issue, or a problem with the iPhone itself.

If you see error 4013 when you try to restore or update your iPhone, there are a few things you can try:

1. **Check your USB cable and port.** Make sure that the USB cable is properly connected to your iPhone and your computer. You can also try using a different USB cable or port.
2. **Restart your computer and your iPhone.** Sometimes, a simple restart can fix problems with restoring or updating your iPhone.
3. **Update iTunes.** If you are using an outdated version of iTunes, you may need to update it.
4. **Restore your iPhone in DFU mode.** DFU mode is a special mode that allows you to restore your iPhone even if it is not responding. To enter DFU mode, press and hold the power button and the home button for about 10 seconds. Then, release the power button and continue holding the home button for about 5 seconds.

Here are some additional things to check:

* **Make sure that you have enough storage space on your computer.**
* **Make sure that you are using the latest version of iOS.**
* **Make sure that your iPhone is not water damaged.**

Learn more@ https://www.youtube.com/c/ITGuides/search?query=iPhone.