Samsung Galaxy A05 (SM-A055F) 'No Display/Backlight' Fix After Android 15 Update: Full Guide

RSL Mobile Solution
17 Aug, 2025

Samsung Galaxy A05 (SM-A055F) “No Display / Backlight” Fix After Android 15 Update: Full Guide



Many Galaxy A05 (SM-A055F) users report a **completely black screen** immediately after updating to **Android 15** (One UI 7). The device is actually ON (charging sound plays), but the display chain fails to initialize.

This professional, field-tested guide provides the definitive fix: **flashing a compatible Android 14 stock firmware** using SamFW Tool. Crucially, we show you how to **blindly enter Download Mode** and verify the **BIT (Bootloader Revision)**—the most critical step for a successful flash.

1) Symptoms & Why Android 15 Causes the Issue

  • ✔️ Screen remains black after booting—no backlight or UI.
  • ✔️ The phone vibrates, and the charging chime plays when plugged in.
  • ✔️ PC detects the device in Device Manager.

Why It Happens After Android 15

Major OS version jumps (like Android 14 to 15) involve significant changes to the kernel, display HAL (Hardware Abstraction Layer), and power management drivers. On certain batches of the **Galaxy A05**, specifically those with certain display panel vendor variants, the new **Android 15 display driver stack** fails to initialize the backlight and panel sequence correctly. Reverting to the tested **Android 14 (One UI 6)** drivers resolves this software conflict immediately.

2) Requirements (Drivers, Tools, Files)

  • **USB Drivers:** Latest Samsung Mobile USB Drivers must be installed. Download USB Drivers
  • **SamFW Tool:** Used for reading Download Mode info (BIT/CSC) and flashing. Download SamFW Tool
  • **WinRAR/7-Zip:** Essential for extracting the firmware files. Download WinRAR
  • **Correct Firmware:** Android 14 firmware matching your specific **BIT** and **CSC/Region**. **(Refer to the Video for Download Source)**
  • **Power:** PC and Phone charged above 60%. Use a reliable, original USB cable.

3) Blind Entry to Download Mode

Since you cannot see the screen, rely on vibration and timing:

  1. **Ensure the device is powered off.**
  2. Press and hold Power + Volume Up + Volume Down simultaneously.
  3. While still holding, connect the USB cable from the phone to the PC.
  4. Wait for a short vibration or restart cue (approx. 5-7 seconds), then **release ONLY the Power key**, keeping both Volume keys held.
  5. After 1-2 seconds, release both Volume keys and press **Volume Up** once to "Continue" into Download Mode.
  6. Verify on your PC that the **Samsung Download Mode COM port** is visible in SamFW or Device Manager.

4) Download the Correct Android 14 Firmware (BIT Check Critical)

A) Check the Bootloader BIT Version

The **Bootloader Integrity Test (BIT)** version is the most critical element. You **MUST NOT** flash a firmware with a lower BIT than what is currently on your device. Doing so will result in a soft-brick or failure.

  1. In **SamFW Tool**, with the phone in Download Mode, go to **Info → Download Mode Info**.
  2. Note the current **BIT/Bootloader Revision**. For example, if the current firmware ends with A055FXXS9, your **BIT is 9**.
BIT Rule: If your phone is on **BIT 9**, you can only flash a firmware that is **BIT 9** or **BIT 10+**. Never flash BIT 8 or lower.

B) Search and Download Firmware

Search trusted Samsung firmware sources (SamFW built-in downloader or official databases) using the exact criteria:

  • **Model:** SM-A055F
  • **Region/CSC:** Use your specific region (e.g., INS, XSG)
  • **Android Version:** **Android 14** (One UI 6)
  • **BIT:** **Same or Higher** than your current BIT.

Example Naming: Look for a file name like A055FXXS9... where the **'S9'** confirms BIT 9.

Firmware Download Note: The exact source and steps for downloading the correct firmware are clearly explained in the embedded video tutorial above. Please follow the instructions in the video to find the correct file matching your BIT version.

5) Extract BL/AP/CP/CSC With WinRAR

The downloaded file is a single compressed ZIP archive. We need to extract the component files required for flashing:

  1. Install **WinRAR** or **7-Zip** on your PC.
  2. Right-click the downloaded firmware ZIP file and select **Extract to Folder Name** to place all files in a single, clean directory.
  3. You will see 5 files, all starting with their designated slot name. These are the **Odin files**:
    • BL_[...] (Bootloader)
    • AP_[...] (Main System/Core)
    • CP_[...] (Modem/Radio)
    • CSC_[...] (Region/Wipe Data)
    • HOME_CSC_[...] (Region/Keep Data)
**WARNINGS:** **Do Not Rename Files** after extraction. For this specific fix, we must use the **CSC** file (which performs a factory reset) to ensure a clean driver installation.

SEO Keywords: Samsung A05 firmware extract, Odin files, BL/AP/CP/CSC meaning.

6) Flash Using SamFW → Odin Flash

This is the final step. Ensure your cable is stable and your phone is still in Download Mode.

  1. Open **SamFW Tool** and navigate to the **Odin Flash** tab.
  2. Load the files into their corresponding slots (match the prefix):
    • Click **BL** and load the BL_[...] file.
    • Click **AP** and load the AP_[...] file.
    • Click **CP** and load the CP_[...] file.
    • Click **CSC** and load the **CSC_[...]** file (to ensure a full repair).
  3. Verify the tool shows your connected device on a **COM Port**.
  4. Click the **Start** button. The process is lengthy, typically **20–30 minutes**. **DO NOT** interrupt or disconnect the cable.
  5. Wait for the tool to display **"PASS"** or **"Reset"**. The phone will automatically reboot.

SEO Keywords: Samsung A05 Odin flash, fix blank screen, SamFW flashing guide.

Video Tutorial

7) After Flash: First Boot Checks

  • ✔️ The first boot may take up to 10 minutes. The **backlight and display** should be visible on the Samsung logo or Setup screen.
  • ✔️ Verify **Android 14** and the correct **BIT** in the phone's settings.
  • ✔️ Test the screen brightness and auto-brightness to confirm full functionality.

8) Pro Tips, Do’s & Don’ts for Technicians

  • ✅ **Do:** Always charge the phone to at least **60%** before starting the flash.
  • ✅ **Do:** Use an **original Samsung or high-quality** USB data cable for stability.
  • ❌ **Don’t:** Flash with a **wrong or lower BIT version**. This is the number one cause of failure.
  • ❌ **Don’t:** Disconnect the phone, open heavy programs, or let the PC sleep during the **20–30 minute** flashing process.
  • 💡 **Repair Insight:** If the issue persists after flashing (which is rare with the correct BIT), the problem is likely hardware (damaged LCD connector/IC) and not the Android 15 bug.

9) Frequently Asked Questions (FAQ)

Q: Can I downgrade from Android 15 to 14?

A: Yes, in terms of Android version. However, the downgrade must respect the **BIT Rule**. You can only flash a firmware with a **BIT version that is the same or higher** than your current one.

Q: Why is my Samsung A05 not showing display but the charging sound works?

A: It's a known **software driver conflict** introduced by the Android 15 update on specific A05 hardware batches. Flashing a stable Android 14 firmware is the guaranteed fix.

Q: Will this solution erase my data?

A: Yes. Because we are using the **CSC** file (not HOME_CSC) to ensure a clean driver installation and fix the bug, flashing the firmware will perform a factory reset and **erase all user data**.

Q: Is this solution safe?

A: This method is **100% safe** provided you use the **correct model and BIT** matching stock Samsung firmware and follow all connection/disconnection steps properly. Your Knox status will remain 0x0.

Disclaimer: This guide is intended for professional use by mobile repair technicians. Proceed at your own risk. RSL Mobile Solution is not responsible for any damage, data loss, or warranty concerns caused by improper execution of these instructions.

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