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boot2 was updated in the [[4.2]] update to [[boot2v4]], the only time Nintendo has ever pushed a boot2 update, besides on [[Prelaunch System Menu|prelaunch consoles]]. This was done by calling ES_ImportBoot to install it into the boot2 region of the NAND. Unfortunately, Nintendo did not test ES_ImportBoot very well, which led to many Wiis receiving a [[Brick#Low Level Brick (LLB)|low-level brick]], even if they were previously unmodded. The cause of this is unknown, although it may be related to the failure to write ECC data.
boot2 was updated in the [[4.2]] update to [[boot2v4]], the only time Nintendo has ever pushed a boot2 update, besides on [[Prelaunch System Menu|prelaunch consoles]]. This was done by calling ES_ImportBoot to install it into the boot2 region of the NAND. Unfortunately, Nintendo did not test ES_ImportBoot very well, which led to many Wiis receiving a [[Brick#Low Level Brick (LLB)|low-level brick]], even if they were previously unmodded. The cause of this is unknown, although it may be related to the failure to write ECC data.
+
+== Format ==
+boot2 is stored in a [[WAD]]-like format.
+
+{| class="wikitable"
+! Offset
+! Length
+! Description
+|-
+| 0x00
+| 4
+| Header length (always 0x20)
+|-
+| 0x04
+| 4
+| Data offset
+|-
+| 0x08
+| 4
+| Length of [[certificate chain]]
+|-
+| 0x0c
+| 4
+| Length of [[ticket]]
+|-
+| 0x10
+| 4
+| Length of [[TMD]]
+|-
+| 0x14
+| 12
+| Padding (always 0)
+|}
+
+Following the header is the certificate chain, then the ticket, then the TMD, and finally the single bootable content{{Ref|https://github.com/fail0verflow/mini/blob/befb64ce1cd493946c9a9a0a412262a998f478d9/boot2.c#L35}}.
== Version history ==
== Version history ==