We are factory, we are professional! Our team has more than 10 years of experience! We pay great attention to quality! Please trust us.If you have any questions or objections after purchasing the product, please do not file a complaint before giving us a chance to solve the problem.After receiving the product, you can contact us by following the steps below: Select My Purchases from the home panel > Select the product you purchased from us > Scroll down, and finally you will find the Messages with Seller section >We recommend that the installation be done by professionals, otherwise your warranty may be voided.Compatibility: Compatible with Poco F4 5g 22021211rgPremium Quality: All screens of Poco F4 5g are 100% checked by a professional QC team before shipment, working perfectly and more usableNote:Test the screen by inserting the flexible board into the motherboard before installation; make sure you feel a gentle tap. If not, try again.Make sure the phone is turned off before installation.Do not press the upper left and upper corners of the screen, otherwise it may cause lines on the screen.Each screw must be installed in the original position because they have different lengths. Never tighten the screws beyond the limit.Treat the flexible cable with care, use tools instead of fingers when installing, otherwise the screen will be damaged. If you encounter problems such as failure to turn on, insensitive touch, flickering, lines on the screen, ghost clicks, etc.Please try the following: Turn off the phone, disconnect all cables including the battery cable, clean the motherboard connector, reconnect the cables, put the phone in a dry environment for a while, reset it, it is difficult to turn on the phone. After-sales service: Dont worry about the difficulty of Poco F4 5g screen replacement. If you have any questions, please feel free to contact us Seller warranty: 1 month