Changes

Movable.sed always exists on retail and development units(written to NAND at the factory), however if reading this file fails(svcBreak would be executed if the [[Filesystem_services_PXI|file-read]] code-path return value is 0xC8804464) the system will fall-back to using a console-unique keyY already in [[PSPXI:GetLocalFriendCodeSeed|memory]], with the last 8-bytes being loaded from the 8-bytes following that u64. On development units the code-path handling movable.sed would execute [[SVC|svcBreak]] if file-reading(regardless of error-code) or verifying the RSA signature fails(this would brick the 3DS), RSA verification failure on a retail unit here would also cause a brick.

Movable.sed always exists on retail and development units(written to NAND at the factory), however if reading this file fails(svcBreak would be executed if the [[Filesystem_services_PXI|file-read]] code-path return value is 0xC8804464) the system will fall-back to using a console-unique keyY already in [[PSPXI:GetLocalFriendCodeSeed|memory]], with the last 8-bytes being loaded from the 8-bytes following that u64. On development units the code-path handling movable.sed would execute [[SVC|svcBreak]] if file-reading(regardless of error-code) or verifying the RSA signature fails(this would brick the 3DS), RSA verification failure on a retail unit here would also cause a brick.

The keyY is hashed with SHA256, the first 0x10-bytes from the hash is used with the below snprintf for ID0 in [[SD Filesystem|sdmc/Nintendo 3DS/<ID0>/<ID1>]] and [[Flash Filesystem|nand/data/<ID0>]]. ID0 is generated by: snprintf(outdirname, maxlen, "%08x%08x%08x%08x", hashword[0], hashword[1], hashword[2], hashword[3]).  Thus, ID0 is the first half of the SHA-256 of movable.sed bytes 0x110-0x11F inclusive with the four u32s of the half-SHA-256 byte-flipped.

The keyY is hashed with SHA256, the first 0x10-bytes from the hash is used with the below snprintf for ID0 in [[SD Filesystem|sdmc/Nintendo 3DS/<ID0>/<ID1>]] and [[Flash Filesystem|nand/data/<ID0>]]. ID0 is generated by: snprintf(outdirname, maxlen, "%08x%08x%08x%08x", hashword[0], hashword[1], hashword[2], hashword[3]).  Thus, ID0 is the first half of the SHA-256 of movable.sed bytes 0x110-0x11F inclusive, with the four u32s of the half-SHA-256 byte-flipped.