| Error Code | Likely Cause | Fix with Unlocktool | | :--- | :--- | :--- | | -20 (Timeout) | Wrong FW version; iOS 15.7.3 ramdisk used on 15.7.1 | Download exact IPSW from ipsw.me, rebuild ramdisk via "Manual IPSW" option | | Kernel Panic (Black screen after Apple logo) | SEP mismatch; Device is iPhone X (A11) | A11 requires disabling the SEP entirely. Use Unlocktool → "Advanced → Disable SEP on Ramdisk" | | File system mount failed (rw) | SSV remains sealed | Re-pwn with "Checkm8-A5" option first; then mount as rdonly,noatime and remount | | No signal after bypass | Baseband firmware not loaded | iOS 15.7 Intel modems require Baseband Ramdisk separate file. Use Unlocktool → "Reload Baseband" |
: This method is primarily used for devices vulnerable to hardware-level exploits, such as the checkm8 exploit found in iPhone 6s through iPhone X. Implementing iOS 15.7 Files in UnlockTool
: While generally reliable for A10 and A11 chips (iPhone 7 to X), users often report "booting ramdisk fail" errors if the incorrect file version or USB cable is used. OTA Updates
In traditional iOS terms, a ramdisk is a temporary storage space loaded into RAM during the boot process. The "File" modifier changes the game.











