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I forgot that i wasnt leaving the back plate an started removing the shielding and ripped it how do i replace it and make the front camera work

The copper shield isn’t really necessary for the screen assembly or front camera assembly. Is the front camera not working? Then you need to replace the front camera assembly. You can buy the replacement front camera from here: iPhone 5s/SE (1st Gen) Front Camera and Sensor Cable Guide to replace the part: iPhone 5s Front Facing Camera and Sensor Cable Replacement Optionally you can buy the copper shield and install it if you want: [linked product missing or disabled: IF124-025-1]