eufyCam C35 SD Card Not Working? Here’s How to Fix It
Your eufyCam C35 records locally to a microSD card (sold separately), so no subscription is needed. eufy cameras use the EXT4 file system, which is the usual reason a card won’t format on a PC.
What This Problem Means
If your eufyCam C35 is showing this fault, working through the checks below in order resolves it in the large majority of cases. Each step is safe to try yourself and follows eufy’s official guidance.
Common Symptoms
- “SD card error” or needs repair
- Card not recognised
- Recordings missing
- Format keeps failing
Safe Checks You Can Try
1. Use a compatible card
Fit a Class 10 / U1 (or faster) microSD card up to 128GB — almost all eufy cameras won’t recognise cards larger than 128GB. Look for the C10, U1, U3, V10 or V30 mark.
2. Reseat the card
Power the camera off, remove the card, and push it back in firmly until it clicks, chip side as shown in the manual.
3. Format it in the app
Go to Camera Settings > Storage and format the card. New cards must be formatted before recording works.
4. Format failures are usually EXT4
eufy cameras use the EXT4 file system, which Windows and macOS can’t create natively — so a card formatted on a PC to FAT32 or exFAT often won’t take. Let the camera format it in-app; if that fails, restart the camera in Device Settings and try again, checking your phone and camera both have a stable connection.
5. Try a known-good card
Swap in a different compatible card to rule out a worn or faulty one — cameras write constantly and wear cards out over time.
6. Update the firmware
Make sure the camera is on the latest firmware, which can fix card-recognition bugs.
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When To Contact Support
If you have worked through every step and your eufyCam C35 still has this problem, the hardware may need attention. Visit eufy support for further help or a replacement if it is in warranty.