| Problem | Solution | | :--- | :--- | | | Restore your EFS backup from TWRP. Always back up EFS before flashing. | | Camera shows green lines | Use Open Camera from Play Store. Disable "Camera2 API" in its settings. | | Phone won't deep sleep | Install a custom kernel (e.g., Helios Kernel for J400F). Check wakelocks via BetterBatteryStats . | | SafetyNet / Play Integrity fails | Install Magisk with Play Integrity Fix module. Or use Kitsune Mask (Magisk fork). | | Sensors (Proximity/Gyro) dead | Flash the persist.img from your stock firmware via TWRP. | Stock ROM vs Custom ROM: Performance Benchmarks We ran Geekbench 5 on a J400F (3GB RAM variant) under different conditions:
Published by: Android Enthusiast Team Reading Time: 8 Minutes Introduction: Why the Samsung Galaxy J4+ (J400F) Still Matters The Samsung Galaxy J4+ (SM-J400F) was a budget king when it launched in 2018. With its 6.0-inch Infinity Display and removable battery, it served millions of users well. However, in 2024 and beyond, the story has changed. Official updates have long ceased. The stock Android 9 (Pie) or Android 10 (if you were lucky) now feels sluggish, cluttered with Samsung bloatware, and vulnerable to security exploits. j400f custom rom
| Test | Stock One UI (Android 10) | LineageOS 20 (Android 13) | Pixel Experience | | :--- | :--- | :--- | :--- | | | 147 | 168 | 161 | | Multi-Core | 498 | 589 | 572 | | RAM Usable | 1.2GB (Out of 3GB) | 2.1GB (Out of 3GB) | 1.9GB | | App Launch (WhatsApp) | 4.2 seconds | 2.5 seconds | 2.8 seconds | | AnTuTu 10 Score | 82,000 | 112,000 | 105,000 | | Problem | Solution | | :--- |
Enter the world of .
Always download ROMs from trusted XDA threads or official Telegram channels. Never use random YouTube links without checking file hashes. Do you have a favorite J400F custom ROM we didn't list? Tell us in the comments below! Disable "Camera2 API" in its settings