CrossMix OS Setup Guide for the Trimui Smart Pro and Brick

The Trimui Smart Pro and Trimui Brick are excellent budget handhelds, and their custom firmware scene is part of the appeal. CrossMix OS has become a go-to choice for these devices. It is a polished, feature-packed firmware that builds on the stock system with better emulator support, useful tools, and a clean look. If you own a Trimui handheld and want to get the most out of it, CrossMix OS is one of the best ways to do that.

This guide explains what CrossMix OS is, which devices it supports, and how to install it, set up WiFi, and add your games. We frame all of this around playing games you already own and preserving your personal collection. The

is a great device to run it on.

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What CrossMix OS Is

CrossMix OS is a custom firmware for Trimui handhelds, built on top of the stock Trimui system. It keeps the device's native feel while adding a stronger emulator lineup, quality-of-life tools, and a more polished experience. It is actively developed, with updates that expand features and improve compatibility.

Supported Devices

CrossMix OS targets the Trimui handheld family.

• Trimui Smart Pro
• Trimui Brick

Check the official CrossMix OS documentation for the exact build that matches your device, since each model needs the correct version.

Why Choose CrossMix OS

If you prefer a stripped-down experience on the same hardware, our NextUI and MinUI setup guide covers a minimal alternative for Trimui devices.

What You Need

• A supported Trimui handheld
• A microSD card, 64GB or larger recommended
• A microSD card reader and a computer
• The latest CrossMix OS release for your device
• A tool to format the card and unzip files

Step 1: Download CrossMix OS

Go to the official CrossMix OS project page and download the latest release for your device. Read the included instructions carefully, since steps can change between versions. Always use the official source.

Step 2: Format the SD Card

Format your microSD card following the project's instructions. A clean format prevents conflicts with leftover files. Back up anything you want to keep before formatting.

Step 3: Copy the Files

Extract the CrossMix OS download and copy its contents to the card following the project's layout. The package usually includes the system files and the folder structure for your games. Match the layout exactly so the firmware boots.

Step 4: First Boot

Insert the card into your Trimui handheld and power on. The first boot may take a little longer while the firmware sets up. When you reach the main menu, CrossMix OS is running. Explore the menus to find the built-in tools and settings.

Step 5: Set Up WiFi

The Trimui Smart Pro and Brick have WiFi, which CrossMix OS can use for transfers and extras. Open the network settings, enable WiFi, and connect. Note any network share or IP details shown, which let you copy games over your network. Our how to transfer ROMs guide covers network transfers.

Step 6: Add Your Games

CrossMix OS uses system folders for your games. Drop your games into the matching folders, and place BIOS files where the documentation says. You supply all games and BIOS files from hardware you own. Our how to organize ROMs and BIOS files guide explains a clean structure.

Step 7: Box Art and Saves

Add box art on device or with Skraper on your computer, as covered in our how to scrape box art guide. Back up your saves regularly, especially before updating, using our how to back up your saves before a firmware update guide.

Troubleshooting

Device will not boot CrossMix OS. The card may be formatted wrong or the build may be for a different model. Re-format and re-copy the correct release for your device.

A game will not launch. Confirm it is in the right system folder and that any required BIOS is present.

WiFi will not connect. Check your network password and that WiFi is enabled in settings.

Recommended Handhelds

CrossMix OS shines on Trimui hardware. The

pairs a widescreen display with the firmware for a great budget setup. The smaller is a fantastic pocket option that also runs it well.

Comparing the two devices? See our Trimui Brick vs Miyoo Mini Plus comparison. For more firmware options, our muOS vs KNULLI vs Onion OS guide covers the Anbernic side.