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mint@mint:/mnt/installed-linux/ios$ sudo ./bin/turdus_merula --get-shcblock iPhone_4.7_14.8_18H17_Restore.ipsw
idevicerestore_fork 1.0.0-git-a73b9de (libirecovery 1.2.1-31-g0b48934, libtatsu 1.0.5-3-g60a39f3)
Found device in DFU mode
ECID: 1707808533447206
Identified device as n71map, iPhone8,1
Device Product Version: N/A
Device Product Build: N/A
Extracting BuildManifest from IPSW
IPSW Product Version: 14.8
IPSW Product Build: 18H17 Major: 18
RAMDisk type: 0x0004
Loading overlay ramdisk...
Loaded embedded overlay ramdisk, length 1048632
Loading Pongo...
Loaded embedded Pongo, length 238128
Loading sep_racer...
Loaded embedded sep_racer module, length 1211568
Loading kpf...
Loaded embedded kpf module, length 92296
Loading cpf...
Loaded embedded cpf module, length 67504
Checking PongoOS image...
Loading image flags...
Checking image flags...
Device supports Image4: true
Variant: Customer Upgrade Install (IPSW)
This restore will update the device without erasing user data.
The following firmwares are currently being signed for iPhone8,1:
  [1] 15.8.8 (build 19H422)
Select the firmware you want to use for the Base: