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Some Mk1C devices with serial numbers MC-110999 or lower may not be able to recognise the microSD card with OS updates. Follow the steps below to change your device so that boot from SD card works.
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Copy the file from the link below to your Mk1C.
https://nanoporetech.box.com/s/2vsqb3d6n5mbbtyrbpu1kyai2p3ohknj
Use the following command at your PC/Mac command line/terminal, respectively, to copy the attached file to your Mk1C:
scp ./u-boot.img minit@<your-device>:/home/minit
Note: if you encounter issues, make sure that your PC/Mac is connected via Ethernet to the same network as your MinION Mk1C.
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Connect to your device using SSH:
ssh minit@<your-device>
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Overwrite the kernel and kernel_b partitions with the image:
sudo dd if=~/u-boot.img of=/dev/disk/by-partlabel/kernel
then run:
sudo dd if=~/u-boot.img of=/dev/disk/by-partlabel/kernel_b
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Reboot the device:
sudo reboot now
Leave the device to boot to completion, and do not turn it off mid-reboot.