[Android Q&A, Help & Troubleshooting] Atifbaig786:
You have To install a Custom Recovery In order to go further.

Install a Custom Recovery Like TWRP or Team Win Recovery Project.

A custom Recovery is similar to Normal recovery that comes with Stock Android Recovery known as Stock Recovery.The question Might arise that why Custom Recovery but first We Must Come To know That What a Recovery do and How does it become "Custom".

Android recovery is a Program embedded in a part of android storage that helps us to recover restore backup or Flash System Packages.

A Stock Recovery would only flash OTA updates that are signed by the system only.More the stock recovery Would Not be able to do Some functions A Power user requires.

Now the answer to the previous Question That " Why Custom recovery" It's because a stock Recovery can't move files and Make backups called Nandroid backupup.

Now a Nandroid backup is a Backup a Tester or a Power User would Usd to save His A.S.S in Times he Would do something that causes something like you have encountered.

Now A custom recovery Can only be Installed via Flashing From A PC using Odin.

Find the Custom Recovery For Your Device Named TWRP.

Choose very carefully this could destroy Your device PERMANENTLY

After finding Your Device specific TWRP recovery once again make clear it is Good for your device.

Check The Whole File name.

It should have A Name Like "Revovery.tar.md5" remember it should have an "tar.md5 or similar" ending if it don't have that format find again a different Version or use a different web to download it Now Flash It Via Odin.How?There are loads of Videos on Youtube Find "How To Flash TWRP via Odin On Any Device"

After getting A TWRP recovery on your device It's time for you to "Boot to TWRP" Here boot means Directly going to a specific Programes like Bootloaders Recovery Download Mode ETC.

Find or Borrow a Card from a Friend or Someone.this would not take long.

It would only take half an Hour.

Now Boot to TWRP.

After booting to TWRP.

There would be many Options.This page is Called TWRP HOME page.

Click on Advanced.

It would open other option.

Click on File manger.

Now There would be a File Manager Simmilar to Root Explorer.

This is Time We Recover your Data.

Find Sdcard from the list click on It.

Then you would See your internal Memory.

Now Go to the folder where you kept your Images or anything

After arriving to that folder click on the floating little folder icon On the Bottom Right of the screen with a Tick Mark on It.

After clicking on it

It would Open A Series of options.

Click on copy or move.

After clicking go back to The Root Directory(The First Screen you got after clicking on File manager is called root directory)

There you should Find a List of folders.click on Storage Then extSDCard.

Now again Click on the floating Folder icon with a TiCk Mark.

It would again Open the Same Screen as Before Select paste.

Now you have just moved a Folder of your data from internal memory to extSdCard.

Go back To the root directory and Repeat Step 1 to End to recover 1 folder per Try.

After recovering all data.

Remove your sdcard Transfr data to pc.

Go to TWRP home.

Select Wipe.

Click on advanced Wipe.

Tick Cache.

Tick Art Dalvik.

Confirm your action.

Reboot The phone.

If it does not Solve the stuck at screen Problem then Go to TWRP home Select Wipe and Factory Reset It.

It should Boot now.

There is one question Left.

What is MTP.

It is Called Media Transfer Protocol.

It is used to transfer files from PC to device or vice versa.

Have a Good day and ask me For help If you get Some more questions or are stuck.