Replace a corroded, damaged, or malfunctioning logic board for an unlocked model A1921 iPhone XS Max. With today's growing cost of devices and so many moving parts to your device, motherboard failures have become much more common. Motherboard repairs and microsoldering are a specialty. Replace a logic board (motherboard) compatible with the model A1784 iPhone 7 Plus (locked to AT&T). By referring to the model number, users can access detailed specifications, firmware updates, and support reso...