Table of contents
1 — Extract the backup archive
We are provided with:
backup.tar.xz
Begin by extracting the archive:
tar -xf backup.tar.xz
Once decompressed, we browse through the extracted directory structure.
2 — Searching for system information
We are looking for Build Version and Model Identifier.
To search efficiently, we can use grep:
grep -r "Build Version"
This reveals a relevant entry inside an Info.plist file.
Opening the file, we locate the values required for the flag:
<key>Build Version</key>
<string>20A362</string>
.
.
.
<key>Product Type</key>
<string>iPhone12,3</string>
Flag
FCSC{iPhone12,3|20A362}