The BitBox02 microSD backup is intentionally designed for practical and reliable recovery. To understand why the backup is not password-protected by default, read why microSD backups should not be encrypted by default.This article helps you troubleshoot common microSD card issues with your BitBox02, such as detection errors, formatting problems, or cards that do not click into place correctly.
A microSD card is used to create and store a BitBox02 backup. If the card is not recognized, the issue is usually caused by one of the following:
- The card was inserted after the BitBox02 was already connected.
- The card is not fully seated in the slot.
- The card type or file system is not supported.
- The card itself is defective.
- In rare cases, the microSD card reader inside the BitBox02 may be defective.
Check the insertion order
The BitBox02 checks for the microSD card during startup. If you insert the card after connecting the BitBox02, the card may not be detected.
- Disconnect your BitBox02 from your computer.
- Hold the BitBox02 with the screen facing you.
- Hold the microSD card with the label facing you.
- Insert the microSD card firmly into the slot.
- Push the card in until you feel it click into place.
- Connect your BitBox02 to your computer.
The microSD card slot has a spring-loaded mechanism. To remove the card, gently push it in again. The spring mechanism will release it.
If the card gets stuck, does not click into place, or feels physically blocked even when inserted correctly, this may indicate a hardware issue. Please record a short video showing the problem and contact our support team with the details.
Verify card compatibility and format
The BitBox02 is designed to work with standard microSD cards. Unsupported cards may not be detected correctly.
Supported card type
Use a standard SDHC (Secure Digital High Capacity) microSD card.
- Supported: SDHC microSD cards
- Not supported: SDXC microSD cards
- Recommended brands: SanDisk or Transcend
- Recommended speed: Standard cards, ideally Speed Class 10 or lower
Very high-speed or high-capacity cards may seem better, but they can occasionally cause compatibility issues. A simple SDHC card is usually the most reliable option for BitBox02 backups.
Correct file format
The microSD card must use one of the following file systems:
- MS-DOS (FAT)
- FAT32
Most SDHC cards are already formatted this way. If you are using a third-party card, it may need to be formatted before the BitBox02 can use it.
Reformat the microSD card if no backup is stored on it
If the microSD card does not contain a BitBox02 backup, you can try reformatting it on your computer.
Only format a new or empty microSD card. If the card already contains a BitBox02 backup, inserting it into another device or handling it incorrectly may expose your recovery words and compromise your wallet and funds. Formatting also permanently erases all data stored on the card.
- Insert the microSD card into a card reader.
- Connect the card reader to your computer.
- Check if your computer recognizes the microSD card.
- Format the card as MS-DOS (FAT) or FAT32.
- Safely remove the card from your computer.
- Insert the microSD card into your BitBox02 before connecting the BitBox02.
- Connect your BitBox02 to your computer.
- Check if the BitBox02 now recognizes the card.
If the BitBox02 recognizes the card after formatting, you can continue using it.
If the card is recognized by your computer but still not by the BitBox02, continue with the next sections.
Test with another microSD card
Testing another card helps determine whether the issue is caused by the card or the BitBox02.
- Disconnect your BitBox02 from your computer.
- Insert another compatible SDHC microSD card.
- Connect your BitBox02 again.
- Check if the BitBox02 recognizes the second card.
If the second card works, the original microSD card is likely defective or incorrectly formatted.
If neither card works, continue with the next section.
Check whether the issue is the card or the BitBox02
If possible, use a card reader to check whether your computer recognizes the microSD card.
If your computer does not recognize the card
The microSD card may be defective.
Try another compatible SDHC card with your BitBox02.
If your computer recognizes the card but the BitBox02 does not
The microSD card may be correctly formatted, but the BitBox02 may not be able to read it.
In this case, please contact our support team and mention that:
- The computer recognizes the microSD card.
- The BitBox02 does not recognize the same card.
- You already tried the insertion and formatting steps.
- You tested another card, if available.
If a computer recognizes the card after troubleshooting, but the BitBox02 still does not, the microSD card reader inside the BitBox02 could be defective.
Use another backup option during setup
If you are setting up your BitBox02 for the first time, or setting it up again after a reset, you can continue without creating a microSD card backup immediately.
- Start the setup process in the BitBoxApp.
- Choose the option to skip the microSD backup.
- Follow the on-screen instructions.
- Create a backup using 24 recovery words instead.
- Add a microSD card backup later once the card issue is resolved.
For setup instructions without a microSD card, follow how to set up your BitBox02 without a microSD card.
To better understand the available backup methods, see advanced backup options for the BitBox02.
Keep your microSD backup secure
A BitBox02 microSD card backup contains the information needed to recover your wallet. Treat it like you would treat your recovery words.
Never enter or restore your BitBox02 backup on another device, website, wallet app, or computer tool. Only use your backup with your BitBox02. The only exception is an emergency situation where you no longer have access to a BitBox02 and must recover your wallet using the microSD card backup.
The BitBox02 microSD backup is intentionally designed for practical and reliable recovery. To understand why the backup is not password-protected by default, read why microSD backups should not be encrypted by default.
If you only have the microSD card backup and no BitBox02 is available, follow the dedicated emergency guide for extracting recovery words from a BitBox microSD backup.
Still having trouble?
If your microSD card is still not working after the steps above, please contact BitBox support and include as much detail as possible.
Please mention:
- Which troubleshooting steps you already tried.
- Whether the microSD card came with your BitBox02 or is a third-party card.
- The brand and model of the microSD card, if known.
- Whether your computer recognizes the microSD card.
- Whether another microSD card works with your BitBox02.
- Your computer’s operating system, such as Windows 11, macOS, or Linux.
- A short video or clear photos showing the issue, if relevant.
This helps us understand whether the issue is likely caused by the card, the formatting, or the BitBox02 microSD card reader.
FAQ
Why does my BitBox02 not recognize the microSD card?
The most common reasons are incorrect insertion order, unsupported card type, incorrect formatting, or a defective microSD card. Insert the card before connecting the BitBox02 and make sure it is a standard SDHC card formatted as FAT or FAT32.
Can I insert the microSD card after connecting the BitBox02?
No. Insert the microSD card before connecting the BitBox02 to your computer. If you insert it after the device is already powered on, the BitBox02 may not detect it.
Which microSD card should I use with the BitBox02?
Use a standard SDHC microSD card from a reputable brand such as SanDisk or Transcend. Avoid SDXC cards and very high-speed cards, as they may cause compatibility issues.
Can I format the microSD card on my computer?
Yes, but only if the card is new or empty. Do not format a card that already contains a BitBox02 backup unless you are sure you no longer need that backup.
My computer recognizes the microSD card, but my BitBox02 does not. What should I do?
Try another compatible SDHC card first. If your computer recognizes the card but the BitBox02 still does not, contact BitBox support and mention this detail. It may indicate an issue with the microSD card reader in the BitBox02.
Can I recover my wallet with only the microSD card backup?
Yes, but this should only be done in an emergency if you no longer have access to a BitBox02. Follow the dedicated guide for emergency recovery from a BitBox02 microSD backup.
Should I enter my microSD backup into another wallet or website?
No. Never enter your BitBox02 backup into another wallet, website, or online tool. Doing so can put your funds at risk. Only use your backup with your BitBox02, except in the documented emergency recovery scenario.