Vivo Z5x

Classification

Vivo Z5x
Classification
Grade	B
Calculator version	1
Classification date	2025-10-09
Information
Name	Vivo Z5x 5G Smart Phone
Brand by Parent	Vivo by Vivo
Generation	Z5x Series (Part of Vivo Z Series)
Model(s)	V1911A, V1911T (Main models for Chinese market; regional variants exist)
Release date	2019-05-01
Type/Category	5G Smart Phone
Website	[1]
Status	End of sale
More
Dimensions	Approximately 162.39 mm (L) × 77.33 mm (W) × 8.85 mm (H)
Mass	Approximately 193 g
Operating system	Pre-installed Funtouch OS 9.1 (Based on Android 9 Pie)
Companion App	Vivo Service, Vivo Official Website, Funtouch OS Security Center
CPU	Qualcomm Snapdragon 712 (2×Cortex-A75 2.3GHz + 6×Cortex-A55 1.7GHz, Samsung 10nm LPP process)
GPU	Qualcomm Adreno 616
Memory	4GB / 6GB / 8GB LPDDR4X (Dual-channel, non-expandable)
Storage	128GB UFS 2.1 (Non-expandable; supports microSD card expansion up to 256GB)
Battery	5000mAh (Typical capacity) lithium polymer battery
Power	18W fast charger (Input: 100-240V ~ 50/60Hz; Output: 9V/2A)
Charging	Supports 18W wired fast charging (vivo FlashCharge); no wireless charging
Display	6.53-inch LCD full-view screen, 2340×1080 (FHD+) resolution, 60Hz refresh rate, 400 nits typical brightness, 16.7 million colors, DC dimming support
Camera	- Rear: 16MP main camera (Samsung S5K3P9, f/1.79 aperture, PDAF) + 8MP ultra-wide-angle camera (f/2.2 aperture, 120° field of view) + 2MP depth camera (f/2.4 aperture) - Front: 16MP selfie camera (Samsung S5K3P9, f/2.0 aperture)
Sound	Single bottom-firing speaker, Hi-Res Audio certification, built-in microphone
Connectivity	- Network: 5G NR, Wi-Fi 5 (802.11ac), Bluetooth 5.0 - Others: NFC (partial models), Infrared remote control - Ports: USB Type-C (2.0), 3.5mm headphone jack

Device
Criterion	Value	Proof(s)	Comment
Known hardware tampering	Rare	[2]	The device features a highly integrated hardware design; disassembly requires professional tools and voids the warranty. Ordinary users have high tampering difficulty, and public hardware tampering cases are extremely rare.
Known vulnerabilities	Rare	[3]	During its support period, Vivo released updates to fix hardware-related vulnerabilities. Due to the model’s age, new vulnerabilities are rarely reported, and public high-risk hardware vulnerability records are scarce.
Prior attacks	None	[No public authoritative links]	There are no reports of large-scale hardware-targeted attacks on the Vivo Z5x. Most security incidents involving the model are software-level (e.g., app vulnerabilities) and unrelated to hardware.
Updatability	Very common	[4]	As a 2019-released model, Vivo has stopped providing major system version updates and regular security patches. Only critical emergency fixes (if any) may be issued, resulting in low updatability.
Category score	2

System
Criterion	Value	Proof(s)	Comment
Authentication with other systems	Partial	[5]	Supports linkage authentication and data synchronization with other vivo devices via Vivo Account. Lacks full cross-platform authentication capabilities outside the vivo ecosystem.
Communications	Encrypted with up-to-date encryption	[6]	Wi-Fi supports WPA3 encryption; Bluetooth 5.0 adopts AES-CCM encryption; 5G communication complies with 3GPP-standard AES encryption, all meeting current security standards.
Storage	Encrypted with up-to-date encryption	[7]	Funtouch OS 9.1 (based on Android 9) enables File-based Encryption (FBE) by default, using the AES-256 algorithm, which is consistent with up-to-date storage encryption standards.
Category score	2

User Authentication
Criterion	Value	Proof(s)	Comment
Account management	Full	[8]	Supports comprehensive management of local accounts and Vivo accounts, including creation, deletion, permission assignment (administrator/standard user), and account password recovery.
Authentication	Secure	[9]	Supports multiple secure authentication methods: password, PIN, side-mounted fingerprint recognition (capacitive), and 2D face recognition.
Brute-force protection	Exist	[10]	The system automatically locks the device for a period (e.g., 30 seconds) after 5 consecutive incorrect authentication attempts, effectively resisting brute-force attacks.
Event logging	Access event logged	[11]	Key access events (e.g., successful login, authentication failure, device lock) are recorded in the system log, which can be viewed via developer mode or professional tools.
Passwords	Require change after setup	[12]	Initial password/PIN setup is mandatory during first boot, but there is no built-in mandatory regular password change requirement. Users can manually set password complexity rules.
Category score	2

Grade	B