Accessing the BIOS (Basic Input/Output System) on a Dell XPS 15 9570 is the primary step for hardware troubleshooting, firmware updates, and system optimization. This laptop, a flagship from Dell's 2018 lineup, relies heavily on its UEFI firmware to manage complex power delivery, thermal profiles, and security features like TPM 2.0. Whether you are looking to change the SATA operation mode for a clean Windows installation or need to update firmware to patch security vulnerabilities, understanding the nuances of the 9570’s BIOS environment is critical.

Quick Access Command for Dell XPS 15 9570 BIOS

For users needing immediate entry, the standard method is to restart the computer and repeatedly tap the F2 key when the Dell logo first appears. If the system boots into Windows too quickly, the alternative path is via Windows Settings > Recovery > Advanced Startup > Troubleshoot > Advanced Options > UEFI Firmware Settings.

Detailed Procedures to Enter BIOS Setup

The Dell XPS 15 9570 utilizes a modern UEFI (Unified Extensible Firmware Interface) rather than a legacy BIOS, though the terms are often used interchangeably. There are three primary ways to access this interface depending on your system's current state.

Using the Function Key During Post

This is the most direct method. It requires precise timing.

  1. Completely shut down the laptop. Ensure all peripheral devices (except the power adapter) are disconnected to prevent boot interference.
  2. Press the Power button.
  3. Immediately begin tapping the F2 key roughly twice per second.
  4. If successful, a blue progress bar will appear under the Dell logo, followed by the BIOS Setup screen.
  5. Note: If you see the Windows "spinning dots" or login screen, you missed the window and must restart.

Accessing via Windows 10 or 11 Advanced Startup

Modern Windows installations often use "Fast Startup," which hibernates the kernel and makes the F2 window incredibly small. If you cannot catch the F2 prompt, use the OS-level bridge:

  1. Navigate to the Start Menu and select Settings (gear icon).
  2. Go to Update & Security (Windows 10) or System (Windows 11).
  3. Select Recovery.
  4. Under Advanced startup, click Restart now.
  5. The system will reboot into a blue "Choose an option" menu. Select Troubleshoot > Advanced options > UEFI Firmware Settings > Restart.

Utilizing the One-Time Boot Menu (F12)

Sometimes, you don't need the full BIOS setup but rather a temporary change in boot priority.

  1. Tap F12 at the Dell logo.
  2. This opens the One-Time Boot Menu.
  3. From here, you can select a USB recovery drive, run Diagnostics (ePSA), or select BIOS Setup to enter the main configuration utility.

Understanding BIOS Versioning and the 1.4.1 Threshold

The Dell XPS 15 9570 has a specific history regarding firmware updates that users must understand before clicking "Update."

The Boot Guard and Downgrade Restriction

Starting with BIOS version 1.4.1, Dell implemented Intel Boot Guard technology as a response to security vulnerabilities like Plundervolt. In our technical assessment of the 9570 firmware history, this was a significant turning point. Once the system is updated to version 1.4.1 or any subsequent version, it is impossible to downgrade to a version earlier than 1.4.1.

This is crucial for enthusiasts who previously used undervolting (via throttlestop or Intel XTU) to manage the 9570's known thermal throttling issues. Later BIOS versions disabled the voltage offset interface to prevent the Plundervolt exploit. If your current workflow relies on specific older firmware behaviors, check your version under the "System Information" tab in the BIOS before proceeding with an update.

Why You Should Keep BIOS Updated

Despite the downgrade restrictions, keeping the BIOS relatively current (e.g., version 1.25.0 or later) is recommended for:

  • Security Patches: Protecting against UEFI-level exploits and Intel ME (Management Engine) vulnerabilities.
  • Thermal Management: Dell frequently tuned the fan curves and power limit throttling (PL1/PL2) through BIOS updates.
  • Battery Reliability: Fixes for "modern standby" issues where the laptop would heat up in a backpack.

Comprehensive Guide to Updating (Flashing) the BIOS

Updating the BIOS on an XPS 15 9570 is a high-stakes procedure. A power failure during this process can brick the motherboard. Follow these steps to ensure a safe flash.

Preparation: The BitLocker Warning

Before any BIOS update, you must suspend BitLocker encryption. BIOS updates change the system's "hardware footprint." If BitLocker is active, it may perceive the update as a security breach and lock you out of your data, requiring a 48-digit recovery key.

  1. In Windows, search for "Manage BitLocker."
  2. Click Suspend Protection.
  3. Confirm with "Yes."

Method 1: Updating via Windows (Recommended for Most)

  1. Visit the Dell Support website.
  2. Enter your Service Tag to ensure you get the exact drivers for your 9570 configuration.
  3. Download the latest XPS_9570_X.Y.Z.exe file.
  4. Ensure your AC adapter is plugged in and the battery is charged to at least 10%.
  5. Close all other applications.
  6. Run the .exe as an Administrator.
  7. The system will warn you that it will restart. Click OK.
  8. The laptop will reboot into a specialized flashing environment. Do not touch the keyboard or power button until it returns to the Windows login screen.

Method 2: Updating via the BIOS Flash Update Utility (Safest)

For users who want to avoid Windows-level interference, use the built-in flash tool.

  1. Format a USB flash drive to FAT32.
  2. Copy the BIOS .exe file to the root of the USB drive.
  3. Plug the USB into the 9570 and restart.
  4. Tap F12 to enter the One-Time Boot Menu.
  5. Select BIOS Flash Update.
  6. Browse to the file on your USB drive and click Begin Flash Update.

Deep Dive into BIOS Settings and Optimization

Once inside the F2 setup menu, you will encounter a variety of settings. For the XPS 15 9570, specific configurations can drastically improve performance and battery health.

System Configuration

  • SATA Operation: By default, Dell ships the 9570 in RAID On mode. If you are performing a clean install of Windows or Linux and using a high-performance NVMe drive (like a Samsung 970 EVO), switching to AHCI is often preferred for better driver compatibility and performance.
    • Warning: Switching this on an existing Windows installation will cause a "Blue Screen of Death" (INACCESSIBLE_BOOT_DEVICE) unless you prepare Windows via Safe Mode first.
  • Drives: Here you can enable or disable the M.2 slot or the 2.5-inch SATA bay (if your model has the smaller battery).
  • USB Configuration: Ensure "Enable External USB Port" is checked. For security-conscious environments, you can disable the USB ports here to prevent data theft.

Video and Display

  • LCD Brightness: You can set the default brightness for both battery and AC power modes. Setting the "Battery" brightness lower here can save power even before the OS loads.

Security and TPM

  • TPM 2.0 Security: This must be "On" and "Enabled" for Windows 11 compatibility. If you see a "TPM not found" error, you may need to clear the TPM or update the firmware specifically for the TPM module.
  • Secure Boot: Generally should be enabled for Windows. If you are dual-booting with certain Linux distributions, you might need to disable this.

Power Management (Crucial for 9570)

  • Primary Battery Charge Configuration: If you primarily use your 9570 plugged into a dock or AC power, change this from "Standard" to "Primarily AC Use." This limits the charge to 80% to prevent battery swelling—a common issue with the 9570 model. Alternatively, use "Custom" to set a start charge at 50% and stop at 80%.
  • Peak Shift: This allows the system to run on battery during specific hours of the day even if plugged in, which can be useful for reducing electricity costs in certain regions.
  • USB Wake Support: Disabling this can prevent the laptop from accidentally waking up in a bag if a USB mouse is moved.

POST Behavior

  • Fastboot: Setting this to "Thorough" ensures the BIOS performs a full hardware check at every boot. While it adds a few seconds to startup, it's safer for identifying failing RAM or SSDs.

Troubleshooting Common BIOS Issues

The "No Bootable Devices Found" Error

If your 9570 suddenly fails to boot, check the Boot Sequence in the BIOS. Ensure that "Windows Boot Manager" is at the top of the list. If you recently switched from RAID to AHCI, or if the CMOS battery is dying, the BIOS might have reverted to default settings that don't match your OS installation.

Locked BIOS (Administrator Password)

The XPS 15 9570 is often used in corporate environments where the BIOS is password-protected. If you purchased a used 9570 and find it locked:

  1. The screen will show "This computer system is protected by a password authentication system."
  2. It will provide a Service Tag followed by a suffix like -E7A8.
  3. If you cannot contact the original owner, you must contact Dell Support with proof of purchase to receive a master override code. There are third-party generators, but they are unreliable and carry security risks.

Running ePSA Diagnostics

If you suspect a hardware failure (e.g., the 9570 is overheating or the screen is flickering):

  1. Hold the Fn key and press the Power button to launch the ePSA (enhanced Pre-boot System Assessment).
  2. The system will perform a series of tests on the CPU, RAM, Fans, and SSD.
  3. Note any "Error Codes" and "Validation Codes." These are essential for Dell warranty claims.

Shared Architecture: Precision 5530

The XPS 15 9570 is hardware-identical in many ways to the Dell Precision 5530 workstation. While advanced users sometimes "cross-flash" Precision firmware onto the XPS to gain access to different driver paths or features, this is not supported by Dell. For the average user, always stick to the official 9570 BIOS files to avoid permanent hardware damage.

Conclusion

The BIOS of the Dell XPS 15 9570 is more than just a pre-boot menu; it is the control center for a machine known for its high performance and thermal challenges. By mastering the F2 and F12 shortcuts, staying aware of the 1.4.1 version lock, and optimizing power management settings, you can significantly extend the lifespan of your laptop. Always remember to prioritize data safety by suspending BitLocker before any firmware changes, and use the official Dell Support site as your primary source for updates.

FAQ

What is the latest BIOS version for the Dell XPS 15 9570? As of late 2024, the BIOS versions have reached into the 1.29.x range or higher. Always check the Dell Support website for the most recent release, as they continue to provide security updates for the 9570.

Does updating the BIOS delete my files? No, a BIOS update only changes the firmware on the motherboard's CMOS chip. It does not touch your SSD or personal data. However, if BitLocker is not suspended, you could be locked out of your files.

How do I reset the BIOS to factory defaults? Enter the BIOS using F2, and look for the "Restore Settings" or "Load Defaults" button at the bottom of the screen. Select "BIOS Defaults" and click OK. This is helpful if you've made a change that caused system instability.

Can I undervolt my 9570 on the latest BIOS? By default, no. Most BIOS versions after 1.4.1 disabled undervolting due to the Plundervolt vulnerability. Some users have found workarounds involving "Factory Resets" within the BIOS or specific EFI variables, but these are advanced and risky procedures.

What should I do if my BIOS update fails and the screen is black? Try the BIOS Recovery feature. Unplug the AC adapter, hold the Ctrl + Esc keys, plug the AC adapter back in, and then release the keys. If the recovery menu appears, you can attempt to restore the previous BIOS version from the hidden recovery partition.