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Extract *.wic.gz image and rename to sysupgrade.wic. For example,

manigandan@manigandan-Latitude-3400:~$ gunzip rdkb-generic-broadband-image_default_20200809095738.rootfs.wic.gz
manigandan@manigandan-Latitude-3400:~$ mv rdkb-generic-broadband-image_default_20200809095738.rootfs.wic sysupgrade.img

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• Connect a USB flash drive to PC that is running Linux. Create a partition in flash drive and format the partition with mkfs.ext2
• Copy both attached medkit image and sysupgrade.img image to USB flash drive.
• Disconnect other USB devices from the Turris Omnia and connect the flash drive to either USB port.

• Hold down the reset button (backside, bottom centre) and plug in the power cord. Wait until the fourth LED lights up (green), then release (before the 5th LED lights up). _{Please check here to see more detail on rescue modes.}

• Wait approximately 2 minutes for the Turris Omnia to flash itself with the temporary image, during which LEDs will change multiple times.

During 4-led upgrade procedure, following things are done:

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Creating additional partitions

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Copy zImage and rootfs files from PC to /tmp/ directory of Turris Omnia which is running RDK Image

For example

scp zImage--4.14.22-r0-turris-20200720105910.bin root@<TurrisOmnia-IP>:/tmp/

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scp rdkb-generic-broadband-image_default_20200720105910.rootfs.tar.gz root@<TurrisOmnia-IP>:/tmp/

In Turris Omnia, execute /lib/rdk/TurrisFwUpgrade.sh  to flash new RDK image present in /tmp folder

sh /lib/rdk/TurrisFwUpgrade.sh

Turris Omnia will now run upgraded version of Yocto based RDK image.