- To use the unpartitioned space, if you use ext4 then this is similar to a standard linux distribution and you can use fdisk to create the partition, mkfs to format it and add it to the fstab to mount it at boot
- For AdGuardHome if you want to replace the DNS server with AdGuardHome follow this guide : [How-To-Updated 2021] Installing AdGuardHome on OpenWrt [Manual and opkg method] , it has all information provided and this is how my setup works
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