Will do once the router is free to test on again.
Update:
Mon Mar 23 15:43:58 2020 user.info adblock-3.99pre3[2233]: adblock instance started ::: action: start, priority: 0, pid: 2233
Mon Mar 23 15:44:03 2020 user.info adblock-3.99pre3[2233]: download of 'adguard' failed, url: https://filters.adtidy.org/windows/filters/15.txt, rule: BEGIN{FS="[/|^|\r]"}/^\|\|([[:alnum:]_-]+\.)+[[:alpha:]]+[\/\^\r]+$/{print tolower($3)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 'filters.adtidy.org'
Mon Mar 23 15:44:51 2020 user.info adblock-3.99pre3[2233]: blocklist with overall 9666 blocked domains loaded successfully (Linksys WRT32X, OpenWrt SNAPSHOT r12567-b052b62efc)
Mon Mar 23 15:45:55 2020 user.info adblock-3.99pre3[6359]: adblock instance started ::: action: start, priority: 0, pid: 6359
Mon Mar 23 15:46:09 2020 user.info adblock-3.99pre3[6359]: blocklist with overall 35510 blocked domains loaded successfully (Linksys WRT32X, OpenWrt SNAPSHOT r12567-b052b62efc)
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_dns ::: dns: dnsmasq, dns_dir: /mnt/sda1/adblock, dns_file: adb_list.overall, dns_user: dnsmasq, dns_inotify: 0, dns_instance: 0, backup: 1, backup_dir: /mnt/sda1/adblock
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_fetch ::: fetch_util: /usr/bin/curl, fetch_parm: --connect-timeout 20 --silent --show-error --location -o
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_bgserv ::: status: stop, bg_pid: -, dns_filereset: 1, ubus_service: /etc/adblock/adblock.monitor
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_uci ::: config: adblock, change: adblock.global.adb_repiface='br-lan'
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_report ::: action: reload, report: 1, search: +, count: 50, process: false, print: false, dump_util: /usr/sbin/tcpdump, repdir: /tmp, repiface: br-lan, replisten: 53, repchunksize: 1, repchunkcnt: 5, bg_pid:
Mon Mar 23 15:47:51 2020 user.info adblock-3.99pre3[6973]: adblock instance started ::: action: reload, priority: 10, pid: 6973
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_jsnup ::: status: running, cnt: 35510, mail: 0, mail_service: /etc/adblock/adblock.mail, mail_cnt: 0, mail_pid: -
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_uci ::: config: dhcp, change: dhcp.cfg01411c.confdir='/mnt/sda1/adblock'
Mon Mar 23 15:47:52 2020 user.debug adblock-3.99pre3[6973]: f_uci ::: config: firewall, change: firewall.adblock_dns_853='redirect' firewall.adblock_dns_853.name='Adblock DNS, port 853' firewall.adblock_dns_853.src='lan' firewall.adblock_dns_853.proto='tcp udp' firewall.adblock_dns_853.src_dport='853' firewall.adblock_dns_853.dest_port='853' firewall.adblock_dns_853.target='DNAT' firewall.adblock_dns_5353='redirect' firewall.adblock_dns_5353.name='Adblock DNS, port 5353' firewall.adblock_dns_5353.src='lan' firewall.adblock_dns_5353.proto='tcp udp' firewall.adblock_dns_5353.src_dport='5353' firewall.adblock_dns_5353.dest_port='5353' firewall.adblock_dns_5353.target='DNAT'
Mon Mar 23 15:47:52 2020 user.debug adblock-3.99pre3[6973]: f_temp ::: tmp_base: /mnt/sda1/adblock, tmp_dir: /mnt/sda1/adblock/tmp.GOEDjE, cores: 2, sort_options: --temporary-directory=/mnt/sda1/adblock/tmp.GOEDjE --compress-program=gzip --batch-size=32 --parallel=2, pid_file: /var/run/adblock.pid
Mon Mar 23 15:48:10 2020 user.debug adblock-3.99pre3[6973]: f_dnsup ::: lookup_util: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_timeout: 5, dns_cnt: 6, in_rc: 0, out_rc: 4
Mon Mar 23 15:48:10 2020 user.debug adblock-3.99pre3[6973]: f_main ::: mem_total: 510, mem_free: 231, max_queue: 4, safe_search: 0, force_dns: 1, awk: /usr/bin/awk
Mon Mar 23 15:48:10 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: whitelist, mode: whitelist, cnt: 38, in_rc: 0, out_rc: 0
Mon Mar 23 15:48:10 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: blacklist, mode: blacklist, cnt: 512, in_rc: 0, out_rc: 0
Mon Mar 23 15:48:15 2020 user.info adblock-3.99pre3[6973]: download of 'adaway' failed, url: https://adaway.org/hosts.txt, rule: /^127\.0\.0\.1[[:space:]]+([[:alnum:]_-]+\.)+[[:alpha:]]+([[:space:]]|$)/{print tolower($2)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 'adaway.org'
Mon Mar 23 15:48:15 2020 user.info adblock-3.99pre3[6973]: download of 'disconnect' failed, url: https://s3.amazonaws.com/lists.disconnect.me/simple_malvertising.txt, rule: /^([[:alnum:]_-]+\.)+[[:alpha:]]+([[:space:]]|$)/{print tolower($1)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 's3.amazonaws.com'
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: disconnect, mode: restore, cnt: 0, in_rc: 6, out_rc: 4
Mon Mar 23 15:48:15 2020 user.info adblock-3.99pre3[6973]: download of 'yoyo' failed, url: https://pgl.yoyo.org/adservers/serverlist.php?hostformat=nohtml&showintro=0&mimetype=plaintext, rule: /^([[:alnum:]_-]+\.)+[[:alpha:]]+([[:space:]]|$)/{print tolower($1)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 'pgl.yoyo.org'
Mon Mar 23 15:48:15 2020 user.info adblock-3.99pre3[6973]: download of 'adguard' failed, url: https://filters.adtidy.org/windows/filters/15.txt, rule: BEGIN{FS="[/|^|\r]"}/^\|\|([[:alnum:]_-]+\.)+[[:alpha:]]+[\/\^\r]+$/{print tolower($3)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 'filters.adtidy.org'
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: adaway, mode: restore, cnt: 0, in_rc: 6, out_rc: 4
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: yoyo, mode: restore, cnt: 0, in_rc: 6, out_rc: 4
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: adguard, mode: restore, cnt: 0, in_rc: 6, out_rc: 4
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: -, mode: merge, cnt: 512, in_rc: 4, out_rc: 0
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_tld ::: source: /mnt/sda1/adblock/tmp.GOEDjE/adb_list.overall, cnt: 512, cnt_tld: 87
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: -, mode: final, cnt: 87, in_rc: 4, out_rc: 0
Mon Mar 23 15:48:28 2020 user.debug adblock-3.99pre3[6973]: f_dnsup ::: lookup_util: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_timeout: 5, dns_cnt: 6, in_rc: 0, out_rc: 4
Mon Mar 23 15:48:28 2020 user.err adblock-3.99pre3[6973]: dns backend restart with adblock blocklist failed
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_dnsup ::: lookup_util: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_timeout: 5, dns_cnt: 6, in_rc: 4, out_rc: 4
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_rmtemp ::: tmp_dir: /mnt/sda1/adblock/tmp.GOEDjE, src_file: /tmp/adb_sources.json, pid_file: /var/run/adblock.pid
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_rmdns ::: dns: dnsmasq, status: true, dns_dir: /mnt/sda1/adblock, dns_file: adb_list.overall, rt_file: /tmp/adb_runtime.json, backup_dir: /mnt/sda1/adblock
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_bgserv ::: status: stop, bg_pid: -, dns_filereset: 1, ubus_service: /etc/adblock/adblock.monitor
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_jsnup ::: status: error, cnt: 0, mail: 0, mail_service: /etc/adblock/adblock.mail, mail_cnt: 0, mail_pid: -
Update 2:
Mon Mar 23 15:44:03 2020 user.info adblock-3.99pre3[2233]: download of 'adguard' failed, url: https://filters.adtidy.org/windows/filters/15.txt, rule: BEGIN{FS="[/|^|\r]"}/^\|\|([[:alnum:]_-]+\.)+[[:alpha:]]+[\/\^\r]+$/{print tolower($3)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 'filters.adtidy.org'
Mon Mar 23 15:44:51 2020 user.info adblock-3.99pre3[2233]: blocklist with overall 9666 blocked domains loaded successfully (Linksys WRT32X, OpenWrt SNAPSHOT r12567-b052b62efc)
Mon Mar 23 15:45:55 2020 user.info adblock-3.99pre3[6359]: adblock instance started ::: action: start, priority: 0, pid: 6359
Mon Mar 23 15:46:09 2020 user.info adblock-3.99pre3[6359]: blocklist with overall 35510 blocked domains loaded successfully (Linksys WRT32X, OpenWrt SNAPSHOT r12567-b052b62efc)
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_dns ::: dns: dnsmasq, dns_dir: /mnt/sda1/adblock, dns_file: adb_list.overall, dns_user: dnsmasq, dns_inotify: 0, dns_instance: 0, backup: 1, backup_dir: /mnt/sda1/adblock
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_fetch ::: fetch_util: /usr/bin/curl, fetch_parm: --connect-timeout 20 --silent --show-error --location -o
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_bgserv ::: status: stop, bg_pid: -, dns_filereset: 1, ubus_service: /etc/adblock/adblock.monitor
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_uci ::: config: adblock, change: adblock.global.adb_repiface='br-lan'
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_report ::: action: reload, report: 1, search: +, count: 50, process: false, print: false, dump_util: /usr/sbin/tcpdump, repdir: /tmp, repiface: br-lan, replisten: 53, repchunksize: 1, repchunkcnt: 5, bg_pid:
Mon Mar 23 15:47:51 2020 user.info adblock-3.99pre3[6973]: adblock instance started ::: action: reload, priority: 10, pid: 6973
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_jsnup ::: status: running, cnt: 35510, mail: 0, mail_service: /etc/adblock/adblock.mail, mail_cnt: 0, mail_pid: -
Mon Mar 23 15:47:51 2020 user.debug adblock-3.99pre3[6973]: f_uci ::: config: dhcp, change: dhcp.cfg01411c.confdir='/mnt/sda1/adblock'
Mon Mar 23 15:47:52 2020 user.debug adblock-3.99pre3[6973]: f_uci ::: config: firewall, change: firewall.adblock_dns_853='redirect' firewall.adblock_dns_853.name='Adblock DNS, port 853' firewall.adblock_dns_853.src='lan' firewall.adblock_dns_853.proto='tcp udp' firewall.adblock_dns_853.src_dport='853' firewall.adblock_dns_853.dest_port='853' firewall.adblock_dns_853.target='DNAT' firewall.adblock_dns_5353='redirect' firewall.adblock_dns_5353.name='Adblock DNS, port 5353' firewall.adblock_dns_5353.src='lan' firewall.adblock_dns_5353.proto='tcp udp' firewall.adblock_dns_5353.src_dport='5353' firewall.adblock_dns_5353.dest_port='5353' firewall.adblock_dns_5353.target='DNAT'
Mon Mar 23 15:47:52 2020 user.debug adblock-3.99pre3[6973]: f_temp ::: tmp_base: /mnt/sda1/adblock, tmp_dir: /mnt/sda1/adblock/tmp.GOEDjE, cores: 2, sort_options: --temporary-directory=/mnt/sda1/adblock/tmp.GOEDjE --compress-program=gzip --batch-size=32 --parallel=2, pid_file: /var/run/adblock.pid
Mon Mar 23 15:48:10 2020 user.debug adblock-3.99pre3[6973]: f_dnsup ::: lookup_util: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_timeout: 5, dns_cnt: 6, in_rc: 0, out_rc: 4
Mon Mar 23 15:48:10 2020 user.debug adblock-3.99pre3[6973]: f_main ::: mem_total: 510, mem_free: 231, max_queue: 4, safe_search: 0, force_dns: 1, awk: /usr/bin/awk
Mon Mar 23 15:48:10 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: whitelist, mode: whitelist, cnt: 38, in_rc: 0, out_rc: 0
Mon Mar 23 15:48:10 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: blacklist, mode: blacklist, cnt: 512, in_rc: 0, out_rc: 0
Mon Mar 23 15:48:15 2020 user.info adblock-3.99pre3[6973]: download of 'adaway' failed, url: https://adaway.org/hosts.txt, rule: /^127\.0\.0\.1[[:space:]]+([[:alnum:]_-]+\.)+[[:alpha:]]+([[:space:]]|$)/{print tolower($2)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 'adaway.org'
Mon Mar 23 15:48:15 2020 user.info adblock-3.99pre3[6973]: download of 'disconnect' failed, url: https://s3.amazonaws.com/lists.disconnect.me/simple_malvertising.txt, rule: /^([[:alnum:]_-]+\.)+[[:alpha:]]+([[:space:]]|$)/{print tolower($1)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 's3.amazonaws.com'
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: disconnect, mode: restore, cnt: 0, in_rc: 6, out_rc: 4
Mon Mar 23 15:48:15 2020 user.info adblock-3.99pre3[6973]: download of 'yoyo' failed, url: https://pgl.yoyo.org/adservers/serverlist.php?hostformat=nohtml&showintro=0&mimetype=plaintext, rule: /^([[:alnum:]_-]+\.)+[[:alpha:]]+([[:space:]]|$)/{print tolower($1)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 'pgl.yoyo.org'
Mon Mar 23 15:48:15 2020 user.info adblock-3.99pre3[6973]: download of 'adguard' failed, url: https://filters.adtidy.org/windows/filters/15.txt, rule: BEGIN{FS="[/|^|\r]"}/^\|\|([[:alnum:]_-]+\.)+[[:alpha:]]+[\/\^\r]+$/{print tolower($3)}, categories: -, rc: 6, log: curl: (6) Couldn't resolve host 'filters.adtidy.org'
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: adaway, mode: restore, cnt: 0, in_rc: 6, out_rc: 4
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: yoyo, mode: restore, cnt: 0, in_rc: 6, out_rc: 4
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: adguard, mode: restore, cnt: 0, in_rc: 6, out_rc: 4
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: -, mode: merge, cnt: 512, in_rc: 4, out_rc: 0
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_tld ::: source: /mnt/sda1/adblock/tmp.GOEDjE/adb_list.overall, cnt: 512, cnt_tld: 87
Mon Mar 23 15:48:15 2020 user.debug adblock-3.99pre3[6973]: f_list ::: name: -, mode: final, cnt: 87, in_rc: 4, out_rc: 0
Mon Mar 23 15:48:28 2020 user.debug adblock-3.99pre3[6973]: f_dnsup ::: lookup_util: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_timeout: 5, dns_cnt: 6, in_rc: 0, out_rc: 4
Mon Mar 23 15:48:28 2020 user.err adblock-3.99pre3[6973]: dns backend restart with adblock blocklist failed
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_dnsup ::: lookup_util: /usr/bin/nslookup, lookup_domain: example.com, restart_rc: 0, dns_timeout: 5, dns_cnt: 6, in_rc: 4, out_rc: 4
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_rmtemp ::: tmp_dir: /mnt/sda1/adblock/tmp.GOEDjE, src_file: /tmp/adb_sources.json, pid_file: /var/run/adblock.pid
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_rmdns ::: dns: dnsmasq, status: true, dns_dir: /mnt/sda1/adblock, dns_file: adb_list.overall, rt_file: /tmp/adb_runtime.json, backup_dir: /mnt/sda1/adblock
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_bgserv ::: status: stop, bg_pid: -, dns_filereset: 1, ubus_service: /etc/adblock/adblock.monitor
Mon Mar 23 15:48:41 2020 user.debug adblock-3.99pre3[6973]: f_jsnup ::: status: error, cnt: 0, mail: 0, mail_service: /etc/adblock/adblock.mail, mail_cnt: 0, mail_pid: -
Mon Mar 23 15:51:19 2020 user.err adblock-3.99pre3[8261]: dns backend 'dnsmasq' not running or executable
Mon Mar 23 15:51:31 2020 user.debug adblock-3.99pre3[8261]: f_dnsup ::: lookup_util: /usr/bin/nslookup, lookup_domain: google.com, restart_rc: 0, dns_timeout: 5, dns_cnt: 6, in_rc: 4, out_rc: 4
Mon Mar 23 15:51:31 2020 user.debug adblock-3.99pre3[8261]: f_rmtemp ::: tmp_dir: -, src_file: /tmp/adb_sources.json, pid_file: /var/run/adblock.pid
Mon Mar 23 15:51:31 2020 user.debug adblock-3.99pre3[8261]: f_rmdns ::: dns: dnsmasq, status: true, dns_dir: /mnt/sda1/adblock, dns_file: adb_list.overall, rt_file: /tmp/adb_runtime.json, backup_dir: /mnt/sda1/adblock
Mon Mar 23 15:51:31 2020 user.debug adblock-3.99pre3[8261]: f_bgserv ::: status: stop, bg_pid: -, dns_filereset: 1, ubus_service: /etc/adblock/adblock.monitor
Mon Mar 23 15:51:32 2020 user.debug adblock-3.99pre3[8261]: f_jsnup ::: status: error, cnt: 0, mail: 0, mail_service: /etc/adblock/adblock.mail, mail_cnt: 0, mail_pid: -
Mon Mar 23 15:52:03 2020 user.err adblock-3.99pre3[8918]: dns backend 'dnsmasq' not running or executable
Edit: Have quickly gone back, will give it another go on a clean install later on tonight when no one needs the network.