1. Setup
1.1 Unpacking and Initial Inspection
Carefully unpack your Yoidesu HiFi MP3 Player. Ensure all included components are present:
- Yoidesu HiFi MP3 Player
- USB Cable
- User Manual (this document)
Inspect the device for any visible damage. If any components are missing or damaged, contact customer support.

Image: The Yoidesu HiFi MP3 Player shown alongside its included USB charging cable.
1.2 Charging the Device
Before first use, fully charge the MP3 player. Connect the provided USB cable to the player's charging port and to a standard USB power adapter (not included) or a computer's USB port. The charging indicator will show the charging status.
1.3 Expanding Storage
The player has 16GB of built-in memory. To expand storage, insert a microSD card (up to 256GB) into the designated slot. The device also supports USB OTG for connecting external storage devices (OTG cable not included).

Image: The Yoidesu HiFi MP3 Player displaying the location of the expandable storage slot, indicating support for up to 256GB.
1.4 Powering On/Off
To power on the device, press and hold the power button until the screen illuminates. To power off, press and hold the power button again until the shutdown prompt appears, then confirm.
2. Operating Instructions
2.1 Basic Navigation and Controls
The Yoidesu HiFi MP3 Player features a 2.4-inch HD display and an intuitive ALPS scroll control for navigation. Use the scroll wheel to browse menus and lists, and press the center button to select items. Dedicated buttons are available for playback control (play/pause, skip tracks) and menu access.

Image: A close-up of the Yoidesu HiFi MP3 Player, highlighting its retro scroll wheel design and surrounding control buttons for intuitive navigation.
2.2 Music Playback
Navigate to the 'Music' section on the device. You can browse by artist, album, genre, or all songs. Select a track to begin playback. The player supports a wide range of high-resolution lossless audio formats, including FLAC, APE, DFF, MP3, WAV, WMA, M4A, MP2, AAC, ALAC, OGG, AIFF, and Native DSD (up to 128-bit/5.6 MHz).
2.3 Bluetooth Connectivity
The player features bidirectional Bluetooth 5.3 with APT-X protocol for high-quality wireless audio.
- Connecting to Bluetooth Headphones/Speakers: Go to the Bluetooth settings menu, enable Bluetooth, and search for available devices. Select your desired device to pair.
- Using as a Bluetooth Receiver: The player can also function as a Bluetooth receiver, allowing you to stream audio from another Bluetooth-enabled device (e.g., smartphone) to the MP3 player's output.
2.4 Connecting to External Audio Systems
The player offers flexible output options:
- Headphone Output: Connect your headphones to the dedicated headphone jack for personal listening.
- Line Output: Use the line output port to connect the player to external amplifiers, home sound systems, or car auxiliary inputs for enhanced audio experience.

Image: A diagram illustrating the improved line output function, showing how the player can connect to both headphones and external audio systems like home stereos or car auxiliary inputs.
2.5 USB Audio Functionality
The digital music player can be connected to a USB amplifier with input to serve as a digital source. It can also be used as an external decoding amplifier when connected to a smartphone or computer, enhancing their audio output quality.
3. Maintenance
3.1 Cleaning the Device
To clean the MP3 player, use a soft, dry, lint-free cloth. Do not use liquid cleaners, aerosols, or harsh chemicals, as these can damage the screen or internal components.
3.2 Battery Care
To maximize battery life:
- Avoid extreme temperatures.
- Do not fully discharge the battery frequently.
- If storing the device for an extended period, charge it to about 50% before storage.
3.3 Software Updates
The device may support automatic software updates. Check the system settings for an 'Auto-upgrade' option or visit the manufacturer's website for information on available firmware updates to ensure optimal performance and access to new features.
4. Troubleshooting
If you encounter issues with your Yoidesu HiFi MP3 Player, refer to the following common solutions:
- Device not powering on: Ensure the battery is charged. Connect the player to a power source and try again.
- No sound: Check headphone connections or Bluetooth pairing. Verify volume levels on both the player and connected audio devices. Ensure the audio file is not corrupted.
- Bluetooth connection issues: Ensure Bluetooth is enabled on both devices. Move devices closer to each other. Try unpairing and re-pairing the devices.
- MicroSD card not recognized: Ensure the card is inserted correctly. Try reformatting the card (this will erase all data). Test with a different microSD card.
- Device unresponsive: Press and hold the power button for 10-15 seconds to force a restart.
If the problem persists, contact Yoidesu customer support for further assistance.
5. Specifications
| Model Number | Yoidesupgt1gf5ybo |
| Display | 2.4 inch HD Screen |
| Internal Storage | 16 GB |
| Expandable Storage | Up to 256 GB (Micro SD card, USB OTG) |
| Supported Audio Formats | FLAC, APE, DFF, MP3, WAV, WMA, M4A, MP2, AAC, ALAC, OGG, AIFF, Native DSD (up to 128-bit/5.6 MHz) |
| Bluetooth Version | 5.3 (Bidirectional, APT-X protocol) |
| Battery Life | Up to 10 hours (via headphones or Bluetooth) |
| Connectivity | Aux, Bluetooth, USB |
| Dimensions | 5.91 x 3.15 x 0.79 inches |
| Item Weight | 6.6 ounces |
| Included Components | User Manual, USB Cable |
6. Warranty and Support
6.1 Product Warranty
For detailed information regarding the product warranty, please refer to the warranty card included with your purchase or visit the official Yoidesu website. Warranty terms and conditions may vary by region and retailer.
6.2 Customer Support
If you require further assistance, have questions not covered in this manual, or experience issues with your device, please contact Yoidesu customer support. Contact information can typically be found on the product packaging or the official Yoidesu website.