Diagnose Samsung Odin super.img FAIL Before Using a PIT File

Flashing official Samsung firmware binaries using the Odin servicing tool is a core recovery procedure for unbricking devices, reverting major operating system updates, or restoring damaged partition tables. However, on modern Samsung Galaxy smartphones—including the Galaxy S26 Ultra, S25 Ultra, and recent A-series hardware—technicians frequently encounter a sudden termination during the write sequence: Odin halts at super.img with a FAIL! (Auth) or FAIL! (Size) status.

These statuses require separate diagnosis before any destructive action. FAIL! (Auth) can reflect signature, authorization, bootloader-revision, or package mismatch. FAIL! (Size) can reflect an image/package mismatch or partition allocation problem, but the status alone does not prove that PIT geometry is the cause.

Always verify your exact device model, firmware build, and the specific Odin log output before proceeding with destructive repartitioning.

Architectural Analysis: Android Dynamic Partitions and PIT Geometry

To diagnose why super.img flashing fails, technicians must understand Samsung’s dynamic partition architecture:

When Samsung releases maintenance updates or new One UI iterations, the physical block allocation allocated to the super partition can expand or contract relative to adjacent partitions. When Odin attempts to write a larger super.img over an older partition layout, the Samsung secondary bootloader (Loke) detects an out-of-bounds write attempt and halts the process.

Using a matching Partition Information Table (.pit) with Re-Partition rewrites storage layout and erases data. It is a last-resort operation only after logs, exact firmware identity, cable/port, archive integrity, and non-destructive stock flashing have been checked.

For workstation driver setup, consult our guide on installing official Samsung Android USB Drivers.

Technical Prerequisites and Required Software Utilities

Assemble verified firmware components and diagnostic tools before initializing the re-partition sequence:

Step-by-Step Procedure: Resolving super.img Flashing Failures

Follow these steps only when model-specific service evidence and the Odin log establish that repartitioning is required. Do not use a PIT merely because the transfer stopped at super.img.

1. Extract PIT File from Firmware

Download the official stock firmware archive matching your exact model number (e.g., SM-S936B). Extract the zip container to access the individual tar archives. Open the CSC_***.tar.md5 file using 7-Zip or WinRAR. Locate the embedded .pit file (e.g., S936B_EUR_OPEN.pit) and extract it to your working folder.

2. Verify Firmware Version (Non-Destructive Diagnostic)

Before utilizing a PIT file (which destroys all user data), ensure you are not simply encountering an anti-rollback (FAIL! (Auth)) error. Boot into Download Mode and read your device’s current bit/binary number (e.g., B: 4). Compare this to the firmware package you are attempting to flash. If the firmware package has a lower binary number, you must download a newer firmware package. Do not use a PIT file to attempt to bypass anti-rollback security.

Note: You do not need to enable OEM Unlocking to flash official, cryptographically signed Samsung stock firmware. OEM Unlocking is only required for custom binaries (like Magisk or TWRP).

3. Boot into Download Mode

If the device is halted on the blue error screen:

1. Press and hold Volume Down and Power simultaneously for 10 seconds to force a power reset.
2. The instant the screen goes dark, immediately press and hold Volume Up and Volume Down.
3. Connect the phone to your computer via USB cable while holding both volume buttons.
4. When the warning interface appears, press Volume Up to confirm Download Mode.

4. Load Firmware Files in Odin

Launch Odin 3.14.4 or newer with administrative permissions. Ensure the ID:COM box highlights blue, confirming host connection. Map the respective firmware binaries to their matching slots:

• BL: Load BL_***.tar.md5
• AP: Load AP_***.tar.md5 (contains super.img)
• CP: Load CP_***.tar.md5
• CSC: Load CSC_***.tar.md5 (Do not use HOME_CSC)

5. Load PIT File and Enable Re-Partition

Navigate to the PIT tab on the left panel of the Odin interface. Click the PIT button and select the extracted .pit file. Ensure that the Re-Partition checkbox is actively checked. Under the Options tab, confirm that Auto Reboot and F. Reset Time remain checked.

Engineering Notice: Re-Partition instructs the storage controller to reallocate physical block structures. All existing userdata partitions will be formatted.

6. Start Flashing Process

Click Start in Odin to initiate transmission. The utility will first transmit the PIT file to rebuild partition boundaries (Get PIT for mapping...), followed by sequential partition writes across bootloader, modem, and dynamic super.img blocks. Flashing typically requires 5 to 10 minutes.

7. Verify Flash and Setup

Upon completion, Odin displays a green PASS! status, and the device reboots automatically. Allow 5 to 10 minutes for the initial system boot and database initialization. Complete the initial setup wizard, open Settings > About Phone, and verify baseband and software build versions.

Technical Troubleshooting Reference

When resolving low-level partition failures on Samsung devices, apply standard diagnostic protocols:

Technical and Regulatory Inquiries

Will using the PIT re-partition method erase user data?

Yes. Enabling Re-Partition alongside an explicit PIT binary completely rebuilds the device storage partition table and formats the userdata partition. A complete backup must be created prior to initiating the flash.

Can I downgrade my Samsung handset to an earlier Android version?

No. Samsung bootloaders enforce hardware-level anti-rollback protection (SW REV check). If the bootloader binary in the firmware has a lower revision number than the bootloader currently flashed on the device, the flash will be rejected immediately with a secure check failure.

Why does Odin halt and display a failure at super.img?

The super.img binary contains dynamic partitions encompassing system, vendor, product, and odm logical blocks. If the physical allocation table on the handset does not match the block size expected by the firmware image, the secondary bootloader halts the flash to prevent storage corruption.

Should technicians use standard CSC or HOME_CSC with the PIT method?

Technicians must use the standard CSC archive (not HOME_CSC) when performing PIT re-partitioning. HOME_CSC attempts to preserve existing block layouts, which conflicts directly with the Re-Partition directive.

Where is the authentic PIT file located within Samsung firmware packages?

A PIT extracted from an exact-model stock package is better evidence than an unrelated download, but its presence does not prove repartitioning is necessary. Verify the model, region, storage variant, and bootloader revision.

Does the PIT re-partitioning process function on both Exynos and Snapdragon variants?

PIT handling exists across Samsung platforms, but file layout and accepted flashing behavior are model and bootloader specific. Never transfer a PIT assumption between Exynos and Snapdragon variants without exact service evidence.

Video Walkthrough

Observe the physical PIT extraction, Odin parameter configuration, and flashing process demonstrated in the following reference guide:

▶Play video: Step-by-step video guide