I got a Nano memory card + official Huawei USB reader so I could transfer my music and other things before my phone arrived. When I connect the reader the laptop is detected and shows 2 drives - nano mem and standard sd - however my laptop just does not detect the nano memory when it is in the reader. The drive letter stays greyed out. Unmounting the SD card and then rebooting your phone can fix this issue in almost all cases. Steps to fix ‘SD card unexpectedly remove error’ using unmount SD card: Go to Settings > storage > click Unmount SD card. Next, remove the SD card from your phone. Reboot the phone. Reinsert the card. Go to Settings > storage and select mount SD Thread Details - HUAWEI Community. Home. There might be a network problem, please try again. Hi,My NM card is unable to be detected on both my mate 20 pro and the card reader.I have lots of data (photos and videos) in the card.Are there any ways to recover back the data?The card lasted me less than a year. Solution 3: Confirm SD card lock status and assess for damage. If the SD card has a physical lock switch, ensure it is not in the locked position. If the SD card is damaged, it may not be recognized by the Mac. In this instance, professional repair or replacement may be necessary. Solution 4: Test SD card reader functionality Use a Different SIM Card with your Huawei nova 3i . If cleaning or replacing the SIM card did not solve the problem, try using a different SIM card. Borrow a SIM card from a friend or family member and insert it into the device. If the device is able to connect to the network with the new SIM card, then the problem is likely with the original Select Troubleshoot on the left pane. Click on Hardware and Devices on the right pane. Click the Run the troubleshooter button. When the tool finishes its work, please see if the SD card reader not working problem is fixed. 5. Change drive letter of SD card. 3 Format Micro SD Card Using Disk Management Tool. Step 1. Go to control panel on your PC. Step 2. Click administrative tools then click “Computer Management”. Step 3. On the computer management, click on "Disk Management", then find the device on the drive viewer. Step 4. Right-click on the micro SD card and select “Format”. This will Recommendations: Go to SD manufacturer's site, search for init/check/partitioning tool for your SD (if not available, find some chip detecting third-party tool which claims the work with SunDisk SDs, detect controller and memory chips models, then search for third-party init/check/partitioning tool for detected models) and try to re-init your SD. UUVHfV.