A. For Samsung Galaxy S21 5G SM-G991 TFT LCD Screen Digitizer Full Assembly with Frame B. Before Installation Notes C. Tips 1: Test before installation D. When testing, do not remove any protective film or tags. Please pay attention to the problem of static electricity. E. Before attempting any repair, be sure to ground yourself with an ESD (electro static discharge) strap. This will prevent static electricity from damaging the electronic components within the phone. F. Ensure you wear eye protection and use caution not to cut your finger with the glass splinters. G. Tips 2: Simulates testing H. Screen replacement is a fragile product. It is suggested to test before installation. Please simulates testing, which means mobile phone apart, (motherboard + LCD or screen) connected audio cable and new replacement, power on, test finished. If test OK, please install it. If it can not show, please contact us at the very first time. And please do not force it to be installed in mobile phone. Responsibility will not be assumed once the screen is installed. I. Tips 3: Do not over-bend cable J. Please make sure LCD cable Do not over-bend. Over 90 degrees bent will cause black display. K. About the product L. 1. LCD display + touch screen digitizer assembly replacement part M. 2. Replace your broken or unusable item with a new one N. 3. Make your device look more refreshing than ever O. 4. Completely fit and work P. 5. Each item has been checked and in good condition before shipping Q. 6. Professional installation is highly recommended. Responsibility will not be assumed once the screen is installed R. 7. Note: No Fingerprint Identification