Follow this guide to replace a bare bones screen on an iPhone 8.This guide includes transferring the Touch ID sensor, earpiece speaker, front camera assembly, and LCD shield plate from the original assembly.
this guide to replace iPhone assembly.
If your replacement display already includes those parts, follow [guide|98255|this shorter guide instead].
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In either case, '''it's important to carefully transfer the original home/Touch ID sensor onto the new display in order for it to function.''' The solidstate home button is paired to its original logic board by Apple, so replacing it will render it unusable.
Replace the LCD screen and digitizer module for the iPhone 8.