How to Bypass iCloud Free on Your iPhone and iPad Using UnlockTool

📅 Updated: June 24, 2026 | ✅ Fact-checked & verified

Bypass iCloud Activation Lock for free using UnlockTool’s Serial Number (SN) method on iPhone 6S through X and compatible iPads running iOS 15-17. This permanent, untethered solution works on Wi-Fi-only devices and requires a DCSD cable.

Download UnlockTool for iCloud Bypass

⚠️ CRITICAL LEGAL DISCLAIMER: READ BEFORE PROCEEDING

Table of Contents

• What is UnlockTool and How Does It Work?
• The Science Behind the SN Method
• Supported iPhones and iPads
• Download UnlockTool
• Step-by-Step iCloud Bypass Guide
• Troubleshooting Common Problems
• Important Limitations
• Video Guide
• FAQs
• Final Verdict

What is UnlockTool and How Does It Work?

UnlockTool is a professional-grade, all-in-one mobile repair suite used by service centers worldwide for FRP removal, firmware flashing, and iCloud bypass. For iCloud Activation Lock, it leverages a hardware-level exploit to permanently rewrite the device’s Serial Number (SN) stored on the NAND chip.

Our Testing Experience: We tested the UnlockTool SN method on 7 iOS devices including iPhone 6S (iOS 15.8), iPhone 7 (iOS 15.7), iPhone 8 (iOS 16.7), iPhone X (iOS 16.6), iPad 5th Gen (iOS 16.5), iPad Pro 1st Gen (iOS 15.8), and iPad Air 2 (iOS 15.7). The method worked on 6 of 7 devices (86% success rate) with the key success factors being a clean SN and a functioning DCSD cable.

Check our UnlockTool review for more features

The Science Behind the SN Method

Every iPhone and iPad has a unique Serial Number (SN), Wi-Fi Address, and Bluetooth Address written onto the NAND flash memory chip. When you link an Apple ID, Apple’s servers record: Serial Number XYZ is locked to Apple ID ABC.

The SN Method works by:

Supported iPhones and iPads

This method works on devices with A7 to A11 Bionic chips. Newer devices are not supported.

Supported Devices Table

Unsupported Devices (DO NOT ATTEMPT)

Download UnlockTool

Download UnlockTool from trusted sources to ensure software integrity and safety.

UnlockTool Specifications

Required Resources

Step-by-Step iCloud Bypass Guide

Before you touch the software, you need two physical things:

1. DCSD Cable: This is non-negotiable. A regular charging cable will not work.
2. Clean Serial Number (SN): A 12-character SN that is not iCloud locked.

Step 1: Download & Install UnlockTool

1. Download UnlockTool from the official source
2. Install on your Windows PC
3. You may need to disable antivirus temporarily (tools like this are often flagged as false positives)
4. Create a free account if required
5. Run the tool and make sure it’s ready

Step 2: Connect Your iPhone/iPad in DFU Mode Using DCSD Cable

1. Plug the DCSD cable into a stable USB port on your PC
2. Put your device into DFU (Device Firmware Update) mode:
   • iPhone 6S/6S Plus: Hold Power + Home Button for 8 seconds, release Power, hold Home for 5 more seconds
   • iPhone 7/7 Plus, 8/8 Plus, X: Hold Power + Volume Down for 8 seconds, release Power, hold Volume Down for 5 more seconds
   • Screen must remain completely black
3. Connect the device to the DCSD cable
4. UnlockTool should recognize the device and show the hardware ID

Step 3: Change the Serial Number (SN Method) in UnlockTool

1. Navigate to the “iCloud” or “Service” tab
2. Find the “Write SN” or “Change Serial Number” function
3. Select your correct device model
4. Enter your 12-character clean serial number
5. Click “Write SN” or “Change SN”
6. Wait for “Write SN Success” or “Operation Complete”

Step 4: Boot into PWNDFU and Ramdisk Mode

1. Use UnlockTool to enter PWNDFU mode
2. Then select “Boot Ramdisk” or similar option
3. Wait for the device to boot into ramdisk mode

Step 5: Execute Final Bypass and Erase Device

1. In ramdisk mode, select “Bypass Hello” option
2. Then perform “Factory Reset” or “Erase Device”
3. The device will reboot with the new serial number

Step 6: Complete Setup and Activate

1. Proceed through the Hello screen setup
2. Connect to Wi-Fi
3. Device will activate with the new serial number
4. iCloud lock is now permanently bypassed

Troubleshooting Common Problems

Problem 1: Device Does Not Connect/Not Recognized

Causes:

• Faulty DCSD cable
• Incorrect drivers
• Wrong USB port
• Not in proper DFU mode

Solutions:

1. Try a different DCSD cable
2. Reinstall Apple Mobile Device drivers
3. Use a USB 2.0 port instead of USB 3.0
4. Verify you’re in DFU mode (black screen)

Problem 2: “Write SN Failed” or “Invalid Serial Number”

Causes:

• Invalid SN (fake number)
• SN already locked to another device
• Tool timeout

Solutions:

1. Get a guaranteed clean, valid SN
2. Don’t guess or use random strings
3. Close UnlockTool, reboot PC, try again immediately

Problem 3: “No Service” or “Searching” After Bypass

This is NOT a problem; it is a permanent consequence.

When we changed the Serial Number (SN), we changed the phone’s system identity. However, we did NOT change the modem’s unique identity (the IMEI). Apple’s servers detect this mismatch and permanently block cellular function.

The device is now Wi-Fi ONLY.

Problem 4: Device Stuck on Apple Logo (Bootloop)

Solutions:

1. Re-enter DFU Mode
2. Use UnlockTool and select “Erase Device”
3. If still stuck, use 3uTools or iTunes to perform a full DFU restore

Important Limitations

This method is raw, effective, and has rules.

Video Guide

Complete step-by-step video of the entire iCloud bypass process:

Subscribe for more tutorials:

• GSM6 Official YouTube Channel
• Learn with AM - Abdul Malik’s Channel

Final Verdict

The UnlockTool SN Method is the most powerful free iCloud bypass solution for older iPhones and iPads. It provides a permanent, untethered solution that works on iOS 15-17.

Pros:

• ✅ 100% free (no payment required)
• ✅ Permanent, untethered bypass
• ✅ Works on iOS 15-17
• ✅ Supports many devices (6S through X)
• ✅ No jailbreak required
• ✅ Survives factory resets and updates

Cons:

• ❌ Wi-Fi ONLY (no cellular service)
• ❌ Requires DCSD cable (not free)
• ❌ Requires clean SN (may cost small fee)
• ❌ Limited to older devices (iPhone X and older)
• ❌ Windows only
• ❌ Risk of bricking device
• ❌ Voids warranty

Rating: ⭐⭐⭐⭐½ (4.5/5)

Why Trust This Review?

Abdul Malik (AM) is a mobile device repair technician with 8+ years of experience specializing in iOS and Android repair. He has performed iCloud bypass on over 100 devices using UnlockTool and other professional tools. His hands-on testing methodology involves live device testing across multiple iOS versions.

Our Testing Methodology: We tested the UnlockTool SN method on 7 iOS devices including iPhone 6S, 7, 8, X, and compatible iPads running iOS 15-17. Each test was conducted twice to verify consistency.

Connect with the author:

• Facebook
• Learn with AM - YouTube Channel
• GSM6 Official YouTube Channel
• Telegram Community
• GSM6 Community Forum

References

1. GSM6 UnlockTool Review
2. GSM6 Broque Ramdisk Tool Guide
3. GSM6 Pandora Tool Guide
4. GSM6 Community Forum