Yes. Installing a custom ROM replaces One UI with AOSP/Pixel software. You will lose apps like Samsung Pay and Samsung Pass. How do I go back to stock?

No Android 15 / A15 GSIs work properly due to kernel driver incompatibilities.

Ensure your phone is charged to at least 70%.

The Samsung A04 is a great device, but its stock ROM may not offer everything you want. Here are a few reasons why you might consider installing a custom ROM:

Flashing custom software trips Samsung’s Knox security , a permanent change that can break Samsung-specific features like Samsung Pay or Secure Folder.

By following the steps outlined in this article, you can unlock the full potential of your Samsung A04 and enjoy a customized Android experience that's tailored to your needs.

| ROM | Status | Working | Broken | |------|--------|----------|--------| | | Stable | Everything | Nothing major | | GSI (AOSP 13/14) | Semi-stable | Boots, WiFi, display | RIL (calls/SMS), audio, camera, sensors | | LineageOS 20 (unofficial) | Abandoned | Boots only | Almost everything | | Ported Unisoc stock from another device | Dangerous | Not recommended | Brick risk |

. It was reliable, but with only 3GB of physical RAM, the heavy One UI Core 5.0 skin was starting to feel its age during multitasking. He didn't want a new phone; he wanted his phone to run faster. He had heard whispers on XDA Forums about a "New A04 Custom ROM" that stripped away the bloat and turned the budget device into a speed demon.

Select your ROM file (If using a GSI .img , ensure you choose to flash it to the partition). Swipe to confirm the flash.

To overcome these challenges, we propose the following solution:

Bottom line: compared to Snapdragon Samsung phones.

The general workflow for Samsung devices in 2026 often follows this path:

Get Android 15 or 16 features before (or instead of) official Samsung updates.