How to Transfer ROMs to Your Handheld (SD Card, WiFi, and FTP)

Getting games onto a retro handheld is one of the first things every new owner figures out. There are three main ways to do it, and each suits a different situation. Some are faster, some are more convenient, and one lets you add games without ever taking the card out. This guide walks through all three so you can pick the method that fits your device and habits.

We frame all of this around moving games you already own onto a device you own. We do not link to or discuss where to download games.

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The Three Methods at a Glance

• SD card reader. The fastest and most reliable way. You remove the card and copy files directly on your computer.
• WiFi network share. Convenient and cable-free. Your handheld appears as a folder on your network.
• FTP transfer. Flexible and great for power users. An FTP app moves files over WiFi with full control.

Most people use a card reader for big initial transfers and WiFi or FTP for adding a few games later.

Method 1: SD Card Reader

This is the method we recommend for your first big load of games. It is fast, simple, and avoids the slow speeds and dropouts that wireless transfers sometimes hit.

1. Power off your handheld and remove the games microSD card.
2. Put the card into a microSD card reader and plug it into your computer.
3. Open the card and find the system folders, such as snes, genesis, or psx.
4. Drag your games into the matching folders. Place BIOS files in the bios folder.
5. Eject the card safely from your computer before pulling it out.
6. Put the card back in your handheld and refresh or reboot.

Always eject the card properly. Yanking it mid-write is the most common cause of corrupted files and lost saves.

A good card reader makes a real difference. The

works with modern laptops and phones, and a quality reader transfers a full library far faster than a cheap one.

Method 2: WiFi Network Share

Many custom firmware options can share their game folders over your home network. Once set up, the handheld shows up like any other shared folder on your computer, and you just drag games over.

1. Connect your handheld to the same WiFi network as your computer.
2. Enable network sharing or Samba in your firmware's network settings. KNULLI, muOS, and ArkOS all support this.
3. Note the device's IP address or network name shown on screen.
4. On Windows, type \\ followed by the IP address into File Explorer. On Mac, use Finder's Connect to Server with smb:// and the IP address.
5. Browse to the games folder and copy your files over.

This is great for adding a handful of games without opening the device. It is slower than a card reader, so it is not ideal for moving hundreds of games at once.

Method 3: FTP Transfer

FTP gives power users the most control. You run an FTP client on your computer and connect to an FTP server running on the handheld.

1. Connect the handheld to WiFi and enable its FTP or SSH service in the network settings.
2. Note the IP address, port, username, and password shown by the firmware.
3. Install a free FTP client on your computer, such as FileZilla.
4. Enter the IP address, port, and login details, then connect.
5. Navigate to the games folder on the device and drag your files across.

FTP is reliable, resumes interrupted transfers, and works well for ongoing additions. The one catch is the small amount of setup. Once it is configured, it is smooth.

Avoiding Corrupted Files and Lost Saves

A few simple habits keep your library and saves safe.

• Eject before removing the card. Safe ejection finishes any pending writes. This is the single most important rule.
• Do not transfer while a game is running. Close out to the menu first, especially for WiFi and FTP.
• Use the right format. Compress big disc games to .chd to save space and speed up transfers.
• Back up your saves first. Before any large transfer or firmware change, copy your saves to your computer. Our how to back up your saves before a firmware update guide covers the routine.

Where to Put Each File

Games go in folders named for each system. BIOS files go in the bios folder. Save files and box art live in their own folders. Getting this right the first time saves a lot of headaches. Our how to organize ROMs and BIOS files guide lays out a clean structure you can follow.

A Note on Card Speed and Size

A faster, larger card makes transfers quicker and gives you room to grow. For a deep dive on which card to buy, see our best microSD cards for retro handhelds guide. A reliable card is worth the small extra cost, since a failed card can take your whole library and saves with it.

Recommended Gear

For frequent transfers, a quality reader and a fast card are the two things that matter most. Pair the

with a name-brand high-endurance card for the smoothest experience. If you are still choosing a handheld, our best retro handhelds guide is a great place to start.