A full reverse-engineering of the Windows 11 25H2 ARM64 hibernation and resume path: how the boot manager decides to resume, how winresume.efi parses and restores hiberfil.sys, the on-disk PO_MEMORY_IMAGE header and compressed-block format, the encryption model (BitLocker for the bulk, AES-GCM for the secure-kernel section), the TRIM-on-resume behavior, and the ARM64 processor-state restore including the PAC keys and SVE. With what is new in Windows 11 and what is specific to ARM64.