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- 22:39, 19 January 2026 IamMyron07 talk contribs created page IPhone Upper-Layer Compatibility Guide (Sandwich Logic Boards) (Created page with "{{Explanatory Guide}} == What Is the “Upper Layer”? == On modern iPhones with sandwich (two-layer) logic boards, the board is split into: * Upper layer – CPU, NAND, Logic EEPROM * Lower layer – Baseband, WiFi and NFC (in some models) An upper-layer swap means transferring the entire top board from one device to another, usually to recover data or restore functionality when the upper layer is damaged. == Compatibility by iPhone Generation == {| class="wikitabl...") Tag: Visual edit