MachO

FAT

IPA

.app (iOS/macOS/Marzipan) / .Framework / .others?

Img2

8900

Img3

encrypted/unencrypted

Img4

IPSW

OTA updates

LZFSE

DMG

& Encrypted uzdo/udzo/whatever

HFS

APFS

Shit used by bridgeos

SEPFW

Device Tree

iTunes backups

Tools

  • Joker
  • img4 (xerub)
  • img4tool (joker)
  • partialzip
  • partialzipbrowser

References

https://www.theiphonewiki.com/wiki/Decrypting_Firmwares

https://www.theiphonewiki.com/wiki/S5L_File_Formats

https://www.theiphonewiki.com/wiki/Disk_Image_Formats

https://www.theiphonewiki.com/wiki/IMG3_File_Format

https://www.theiphonewiki.com/wiki/IPA_File_Format

http://luca.ntop.org/Teaching/Appunti/asn1.html