The answer is user data such as photos and contacts, because a factory reset on Android only unmounts the userdata partition and marks its blocks as free in the filesystem metadata, leaving the actual raw data physically intact in NAND flash memory until overwritten. This concept is critical for the Computer Hacking Forensic Investigator CHFI exam, where you must understand that a standard factory reset does not securely erase data—it simply removes the logical pointers. A common trap is assuming the reset wipes the storage clean, but forensic tools that bypass the filesystem can directly read the flash memory and recover recoverable user data after factory reset Android flash memory. Remember the mnemonic: “Reset removes the map, not the treasure.”
CHFI Mobile and Malware Forensics Practice Question
This CHFI practice question tests your understanding of mobile and malware forensics. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
A forensic examiner is analyzing an Android device that has been factory reset. Which of the following artefacts is MOST likely to still be recoverable from the device's flash memory after a factory reset, assuming no overwrite has occurred?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
User data such as photos and contacts
After a factory reset on an Android device, the operating system typically performs a 'fastboot format' or 'wipe data/factory reset' which only unmounts the userdata partition and marks its blocks as free in the ext4 or F2FS filesystem metadata. The actual user data (photos, contacts, etc.) remains physically stored in the NAND flash memory until those blocks are overwritten by new data. Because no overwrite has occurred in this scenario, the raw data is still recoverable using forensic tools that bypass the filesystem and read the flash memory directly.
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.
✗
The GUID Partition Table (GPT)
Why it's wrong here
GPT is partition metadata, not user data.
✗
The device's encryption keys
Why it's wrong here
Encryption keys are generated during setup and may be wiped during reset.
✗
The Android OS system files
Why it's wrong here
System files are on the system partition, which is not wiped during factory reset.
✓
User data such as photos and contacts
Why this is correct
User data may be recoverable from unallocated space after a factory reset if not overwritten.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
EC-Council often tests the misconception that a factory reset securely erases all data, when in fact it only removes filesystem pointers, leaving the underlying data recoverable until overwritten.
Detailed technical explanation
How to think about this question
Factory reset on Android uses the 'wipe_data' command in recovery mode, which issues an 'fstrim' or 'discard' operation on the userdata partition to inform the flash translation layer (FTL) that blocks are no longer in use. However, NAND flash memory does not physically erase data on discard; it only marks the logical-to-physical mapping as invalid. Forensic tools like Cellebrite UFED or XRY can perform a physical dump of the raw NAND and carve deleted files using signatures (e.g., JPEG headers, SQLite database headers) from the unallocated space. In real-world cases, examiners have recovered years-old photos and contacts even after multiple factory resets, provided the blocks were not overwritten by subsequent usage.
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 practitioner preparing for the CHFI exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
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: User data such as photos and contacts — After a factory reset on an Android device, the operating system typically performs a 'fastboot format' or 'wipe data/factory reset' which only unmounts the userdata partition and marks its blocks as free in the ext4 or F2FS filesystem metadata. The actual user data (photos, contacts, etc.) remains physically stored in the NAND flash memory until those blocks are overwritten by new data. Because no overwrite has occurred in this scenario, the raw data is still recoverable using forensic tools that bypass the filesystem and read the flash memory directly.
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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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