After the update to 3.207, AdGuardHome did not work for me (version 0.106.3 was working before the update ). The Plugins page indicated the latest (0.106.3) was intalled and offered only the uninstall option.
However, in the ssh console, the system showed (opkg list-installed) version 0.104.3 was installed. Therefore, I ran opkg upgrade AdGuardHome, then /etc/init.d/AdGuardHome start and everything is working now.

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