Samsung Galaxy Z Fold5 SM-F946B UFS Dump File (Bit 1 Dead Boot Repair)

What is the Samsung Galaxy Z Fold5 SM-F946B UFS Dump File?

This is a premium Samsung Galaxy Z Fold5 (SM-F946B) UFS dump file (Bit 1 / Binary U1). Unlike older eMMC-based devices, the Fold5 utilizes high-speed UFS 4.0 storage technology, requiring specific data structures and advanced programming tools for successful repair.

This dump file is a raw image of the device's internal UFS storage, captured from a fully functional unit. It is designed for Level 3 and Level 4 board repairs where the bootloader is corrupted, the device is completely dead (Qualcomm 9008 mode only), or the UFS chip has been replaced.

Supported Repair Scenarios

This file is critical for the following hardware-level repair situations:

• Dead Boot Repair: The device draws low current (0.05A - 0.18A) and does not power on due to corrupted boot partitions (LUN0/LUN1/LUN2).
• Blank UFS Programming: formatting and initializing a brand new UFS chip after physical replacement.
• Qualcomm 9008 "Dead" Mode: Solving cases where the device is stuck in EDL (Emergency Download Mode) and cannot be flashed via Odin.
• Stuck on Logo / Boot Loop: Fixing persistent boot loops caused by partition table corruption that standard firmware cannot repair.
• RPMB Provisioning: (Note: RPMB is clean/unprovisioned in new chips; this dump provides the necessary non-secure partition data to get the phone booting to Download Mode).

Compatible UFS Programming Tools

Due to the UFS 4.0 architecture of the Galaxy Z Fold5, you must use high-speed hardware programmers that support UFS BGA types (BGA-297 / BGA-254). Older eMMC-only boxes will NOT work.

Recommended Tools:

• EasyJTAG Plus (with UFS Socket): Supports high-speed UFS writing. Ensure you select the correct LUN configuration before writing.
• Medusa Pro II: Highly recommended for UFS 3.1/4.0 devices due to its high transfer speeds and stable UFS protocol support.
• UFI Box (UFS Prog): Requires the UFS add-on interface. Verified for reading/writing config descriptors and user partitions.
• MiPi Tester Box: Advanced tool for UFS health checking and reprogramming.

Programming Method: ISP vs. Chip-Off

Warning: The Galaxy Z Fold5 uses a complex multi-layer motherboard.
1. UFS ISP (In-System Programming): While UFS ISP pinouts (CLK, CMD, D0, RST, VCC, VCCQ) technically exist, the signal speeds of UFS 4.0 make ISP unstable on many setups. Use short, high-quality wires if attempting ISP.
2. Chip-Off (Direct Programming): The most reliable method. Desolder the UFS chip and place it in a matching BGA socket on your programmer. This ensures 100% data integrity during the write process.

File Details

Use Instructions

1. Connect the UFS chip to your hardware tool.
2. Take a backup of the original LUN CONFIG and specific security partitions (EFS, SEC_EFS) if readable.
3. Erase the UFS chip (if not critical data recovery).
4. Write the provided Dump file (LUN0, LUN1, LUN2, LUN3, etc.).
5. Reball and install the UFS chip back onto the motherboard.
6. Put the phone into Download Mode and flash the latest stock firmware (Bit 1 or higher).

Related Technical Resources

Expand your repair capabilities with these related resources:

• Samsung Firmware & Repair Files Collection - Official stock ROMs.
• eMMC & UFS Dump File Database - Full archive of dump files.
• Samsung S25 Ultra ISP UFS Pinout Guide - Reference for flagship UFS connection methods.
• Pixel 9 Pro Fold Engineering Firmware - For similar foldable device repair challenges.
• Samsung S20 5G UFS ISP Pinout - Guide for previous gen UFS pinout handling.

Disclaimer

Professional Use Only: This file is intended for certified mobile technicians and engineers. Board-level repair on the Galaxy Z Fold5 involves high risks. We are not responsible for damage caused by improper handling, overheating, or incorrect programming. Ensure you have the proper BGA stencils and reballing experience before attempting this repair.