The answer is to boot into recovery mode and use ADB to dd the userdata partition. This method is correct because recovery mode keeps the filesystem unmounted, preventing data corruption, while root privileges allow the `dd` command to read the raw block device for a bit-for-bit physical image—all without needing to bypass the locked PIN screen. On the CHFI exam, this question tests your understanding of forensic acquisition techniques for Android devices, specifically the distinction between logical and physical imaging; a common trap is assuming you must unlock the screen or use a tool like Cellebrite, but recovery mode bypasses that need entirely. Remember the key principle: recovery mode + root + dd equals a clean physical acquisition. Memory tip: “Recovery roots raw data” to recall that recovery mode provides root access to the raw partition for imaging.
CHFI Mobile and Malware Forensics Practice Question
This CHFI practice question tests your understanding of mobile and malware forensics. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An Android device is seized as evidence. The screen is locked with a PIN. Which tool or method is MOST appropriate for acquiring a physical image of the device without bypassing the lock screen, assuming the device is rooted?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Boot into recovery mode and use ADB to dd the userdata partition
Option A is correct because booting into recovery mode on a rooted Android device allows you to use ADB to execute the `dd` command, which can create a bit-for-bit physical image of the userdata partition without needing to bypass the lock screen. Since the device is rooted, you have the necessary privileges to read the raw block device, and recovery mode ensures the filesystem is not mounted, preventing data corruption during acquisition.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Boot into recovery mode and use ADB to dd the userdata partition
Why this is correct
With root and recovery mode, dd can create a physical image even if the screen is locked.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use Cellebrite UFED with a lock screen bypass exploit
Why it's wrong here
While possible, this assumes a bypass is available. The question specifies a rooted device; ADB dd is simpler.
✗
Remove the microSD card and image it separately
Why it's wrong here
The question refers to internal storage; external SD card does not contain all device data.
✗
Perform an ADB backup to obtain app data only
Why it's wrong here
ADB backup is logical, not physical, and requires device authorization.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the distinction between physical and logical acquisition methods, and the trap here is that candidates may choose ADB backup (Option D) thinking it is a valid physical acquisition, when in fact it only captures a logical subset of data and cannot recover deleted or system-level artifacts.
Detailed technical explanation
How to think about this question
The `dd` command in recovery mode reads the raw block device (e.g., `/dev/block/mmcblk0p25` for userdata) and outputs a forensic image that includes unallocated space, deleted files, and file system metadata. This method relies on the device being rooted to access the block device directly, and recovery mode prevents the Android OS from mounting the partition, ensuring the image is consistent and not altered by the running system. In practice, this approach is critical when the lock screen cannot be bypassed but root access is available, as it preserves the integrity of the evidence.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A junior network technician can log in to a core router but cannot reach the enable prompt or configuration mode. The AAA server is authenticating the login — but the authorisation policy only grants privilege level 1, not 15. Authentication (who you are) is working; authorisation (what you can do) is not.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this CHFI question in full detail.
Mobile and Malware Forensics — This question tests Mobile and Malware Forensics — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Boot into recovery mode and use ADB to dd the userdata partition — Option A is correct because booting into recovery mode on a rooted Android device allows you to use ADB to execute the `dd` command, which can create a bit-for-bit physical image of the userdata partition without needing to bypass the lock screen. Since the device is rooted, you have the necessary privileges to read the raw block device, and recovery mode ensures the filesystem is not mounted, preventing data corruption during acquisition.
What should I do if I get this CHFI question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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This CHFI practice question is part of Courseiva's free EC-Council certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CHFI exam.
Question Discussion
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