Samsung Galaxy Z Flip4 (SM-F721B) — SLK
Samsung Galaxy Z Flip4 Released 2022, August 25 | 187g, 6.9mm thickness | Android 12, up to Android 16, One UI 8 | 128GB/256GB/512GB storage, no card slot | Foldable Dynamic AMOLED 2X, 120Hz, HDR10+, 1200 nits (peak) | 12 MP, f/1.8, 24mm (wide), 1/1.76", 1.8µm, dual pixel PDAF, OIS 12 MP, f/2.2, 13mm, 123˚ (ultrawide), 1/3.06", 1.12µm | Li-Po 3700 mAh
Samsung Galaxy Z Flip4 Network Specifications
| Speed | HSPA, LTE (6CA), 5G |
| 5G | 1, 2, 3, 5, 7, 8, 12, 20, 25, 28, 38, 40, 41, 66, 75, 77, 78 SA/NSA/Sub6 - International |
| 4G | 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 38, 39, 40, 41, 66 |
| 3G | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 |
| 2G | GSM 850 / 900 / 1800 / 1900 |
| Technology | GSM / CDMA / HSPA / EVDO / LTE / 5G |
Samsung Galaxy Z Flip4 body Specifications
| SIM | Nano-SIM + eSIM |
| Build | Plastic front (unfolded), glass back (Gorilla Glass Victus+), aluminum frame |
| Weight | 187 g (6.60 oz) |
| Dimensions | Unfolded: 165.2 x 71.9 x 6.9 mm Folded: 84.9 x 71.9 x 15.9-17.1 mm |
Samsung Galaxy Z Flip4 MISC Specifications
| SAR EU | 1.15 W/kg (head) 1.20 W/kg (body) |
| SAR US | 1.02 W/kg (head) 0.94 W/kg (body) |
| Colors | Bora Purple, Graphite, Pink Gold, Blue, Yellow, White, Navy, Khaki, Red |
Samsung Galaxy Z Flip4 display Specifications
| Resolution | 1080 x 2640 pixels (~426 ppi density) |
| Size | 6.7 inches, 101.5 cm 2 (~85.4% screen-to-body ratio) |
| Type | Foldable Dynamic AMOLED 2X, 120Hz, HDR10+, 1200 nits (peak) |
Samsung Galaxy Z Flip4 Sound Specifications
| 3.5mm jack | No |
| Loudspeaker | Yes, with stereo speakers |
Samsung Galaxy Z Flip4 Platform Specifications
| GPU | Adreno 730 |
| CPU | Octa-core (1x3.19 GHz Cortex-X2 & 3x2.75 GHz Cortex-A710 & 4x1.80 GHz Cortex-A510) |
| Chipset | Qualcomm SM8475 Snapdragon 8+ Gen 1 (4 nm) |
| OS | Android 12, upgradable to Android 16, One UI 8 |
Samsung Galaxy Z Flip4 Battery Specifications
| Charging | 25W wired, 50% in 30 min 15W wireless 4.5W reverse wireless |
| Battery | Li-Po 3700 mAh |
Samsung Galaxy Z Flip4 memory Specifications
| Internal | 128GB 8GB RAM, 256GB 8GB RAM, 512GB 8GB RAM |
| Card slot | No |
Samsung Galaxy Z Flip4 Main Camera Specifications
| Video | 4K@30/60fps, 1080p@60/240fps, HDR10+ |
| Features | LED flash, HDR, panorama |
| Camera | 12 MP, f/1.8, 24mm (wide), 1/1.76", 1.8µm, dual pixel PDAF, OIS 12 MP, f/2.2, 13mm, 123˚ (ultrawide), 1/3.06", 1.12µm |
SLK Region Firmware Info
SLK - Sri LankaA CSC (Consumer Software Customization) code ties a Samsung firmware build to the country and carrier it was released for, controlling branding, available languages and which OTA updates a device receives. The SLK code is used in Sri Lanka by Dialog, Mobitel, Etisalat, Airtel, Hutch, with 3 distinct Samsung Galaxy Z Flip4 firmware versions found so far.
SLK Firmware Version History
| Version | Build Date | Security Patch |
|---|---|---|
| F721BXXSCIZH3 | 2026-08-14 | — |
| F721BXXSCIZG3 | 2026-07-09 | — |
| F721BXXSCIZF1 | 2026-06-12 | — |
3 Samsung Galaxy Z Flip4 firmware versions found for the SLK region, newest first.
Samsung Galaxy Z Flip4 SLK Firmware ArchiveOfficial Samsung Galaxy Z Flip4 firmware for the Sri Lanka SLK region, including BL, AP, CP, CSC and HOME_CSC packages for Odin flashing.
Samsung Galaxy Z Flip4 Combination & Special FilesCombination and service files for the Samsung Galaxy Z Flip4 (SM-F721B) — authorized repair, FRP reset after service, and diagnostics.
| Device Mobile | Version | Bit - SW REV | FA | Change list | Updated | Status |
|---|---|---|---|---|---|---|
SLK Firmware FAQ
Which carriers use the SLK CSC on the Samsung Galaxy Z Flip4?+
The SLK CSC is used by Dialog, Mobitel, Etisalat, Airtel, and Hutch in Sri Lanka. Flash the SLK firmware only if your device was sold through one of these carriers.
How many Samsung Galaxy Z Flip4 firmware versions are available for the SLK region?+
3 distinct Samsung Galaxy Z Flip4 firmware versions have been found for the SLK (Sri Lanka) region so far, from oldest to the latest build.
How is the SLK CSC different from other region codes?+
Samsung ties every firmware build to one of roughly 599 CSC (Consumer Software Customization) codes, each tied to a specific country and carrier. SLK is the code for Sri Lanka (Dialog, Mobitel, Etisalat, Airtel, and Hutch) — flashing a different CSC can change your carrier branding, available languages and which OTA updates you receive.