A target device with maxed-out physical storage cannot handle temporary unpacking files, forcing an AMRestoreErrorDomain code: 75 crash.
If a degraded phone battery causes voltage drops during firmware unpacking, 3uTools has an explicit toggle to bypass this. Put your iPhone into or DFU Mode . Open 3uTools and click on the Smart Flash tab at the top. Download or import the matching firmware version. 3utools error unable to restore idevice--75-
3uTools error code -75 (often paired with the message "Unable to restore iDevice") A target device with maxed-out physical storage cannot
| Cause Category | Specific Reason | |----------------|----------------| | | Physical damage to the cellular modem chip (e.g., water damage, drop damage). | | Incompatible firmware | Attempting to flash an iOS version that doesn’t match the device’s baseband version (common with custom IPSWs or beta versions). | | Corrupt baseband signature | Improper shsh blobs or baseband certificate mismatch (especially with downgrades). | | Cable/USB port issues | Unstable data transmission during the critical baseband write phase. | | Antiquated iTunes / Apple Mobile Device drivers | 3uTools relies on drivers; outdated or corrupted drivers cause communication breakdowns during baseband flashing. | | Device in an invalid state | Restoring from a jailbroken state with leftover baseband modifications. | | Intel baseband bug | iPhone 7 (A1660, A1778, A1780), iPhone 8, iPhone X with Intel modems are more prone to baseband write errors. | Open 3uTools and click on the Smart Flash tab at the top