upgraded x86 to RC4 and almost everything works - thank-you to all contributors 
The one issue is with DDNS using dynu.com on ipv4. ipv6 with dynu.com succeeds, and ipv4 with changeip.com also works. Please let me know what further information (if any) is required?
Mon Dec 30 17:46:37 2024 daemon.warn dnsmasq[1]: possible DNS-rebind attack detected: xxx.xxx
Mon Dec 30 17:46:37 2024 user.warn ddns-scripts[5803]: xxx_xxx_ipv4: NO valid IP found
Mon Dec 30 17:46:37 2024 user.warn ddns-scripts[5803]: xxx_xxx_ipv4: Get registered/public IP for 'xxx.xxx' failed - retry 1/0 in 60 seconds
Mon Dec 30 17:46:37 2024 user.notice ddns-scripts[9474]: xxx_xxx_ipv4: PID '9474' started at 2024-12-30 17:46
Mon Dec 30 17:46:37 2024 user.notice ddns-scripts[5803]: xxx_xxx_ipv4: PID '5803' terminated by 'SIGTERM' at 2024-12-30 17:46
Mon Dec 30 17:46:37 2024 daemon.warn dnsmasq[1]: possible DNS-rebind attack detected: xxx.xxx
Mon Dec 30 17:46:37 2024 user.warn ddns-scripts[9474]: xxx_xxx_ipv4: NO valid IP found
Mon Dec 30 17:46:44 2024 daemon.warn dnsmasq[1]: possible DNS-rebind attack detected: xxx.xxx
173636 : ************ ************** ************** **************
173636 note : PID '5803' started at 2024-12-30 17:36
173636 : ddns version : 2.8.2-52
173636 : uci configuration:
ddns.xxx_xxx_ipv4.cacert='/etc/ssl/certs'
ddns.xxx_xxx_ipv4.check_unit='minutes'
ddns.xxx_xxx_ipv4.domain='xxx.xxx'
ddns.xxx_xxx_ipv4.enabled='1'
ddns.xxx_xxx_ipv4.force_unit='minutes'
ddns.xxx_xxx_ipv4.interface='wan'
ddns.xxx_xxx_ipv4.ip_network='wan'
ddns.xxx_xxx_ipv4.ip_source='network'
ddns.xxx_xxx_ipv4.lookup_host='xxx.xxx'
ddns.xxx_xxx_ipv4.password='***PW***'
ddns.xxx_xxx_ipv4.retry_unit='seconds'
ddns.xxx_xxx_ipv4.service_name='dynu.com'
ddns.xxx_xxx_ipv4.use_https='1'
ddns.xxx_xxx_ipv4.use_ipv6='0'
ddns.xxx_xxx_ipv4.use_syslog='2'
ddns.xxx_xxx_ipv4.username='xxxdynu'
ddns.xxx_xxx_ipv4=service
173636 : verbose mode : 0 - run normal, NO console output
173636 : check interval: 600 seconds
173636 : force interval: 4320 seconds
173636 : retry interval: 60 seconds
173636 : retry max count : 0 times
173636 : No old process
173636 : last update: never
173636 : Detect registered/public IP
173636 : #> /usr/bin/nslookup xxx.xxx >/var/run/ddns/xxx_xxx_ipv4.dat 2>/var/run/ddns/xxx_xxx_ipv4.err
173636 WARN : NO valid IP found
173636 info : Starting main loop at 2024-12-30 17:36
173636 : Detect current IP on 'network'
173636 : Current IP '112.199.240.81' detected on network 'wan'
173636 : Update needed - L: '112.199.240.81' <> R: ''
173636 : Force communication via IP '112.199.240.81'
173636 : #> /usr/bin/wget --hsts-file=/tmp/.wget-hsts -nv -t 1 -O /var/run/ddns/xxx_xxx_ipv4.dat -o /var/run/ddns/xxx_xxx_ipv4.err --bind-address=112.199.240.81 --ca-directory=/etc/ssl/certs --no-proxy 'https://api.dynu.com/nic/update?hostname=xxx.xxx&myip=112.199.240.81&username=xxxdynu&password=***PW***'
173637 : DDNS Provider answered:
good 112.199.240.81
173637 info : Update successful - IP '112.199.240.81' send
173637 info : Forced update successful - IP: '112.199.240.81' send
173637 : Waiting 600 seconds (Check Interval)
174637 : Detect registered/public IP
174637 : #> /usr/bin/nslookup xxx.xxx >/var/run/ddns/xxx_xxx_ipv4.dat 2>/var/run/ddns/xxx_xxx_ipv4.err
174637 WARN : NO valid IP found
174637 WARN : Get registered/public IP for 'xxx.xxx' failed - retry 1/0 in 60 seconds
174637 : ************ ************** ************** **************
174637 note : PID '9474' started at 2024-12-30 17:46
174637 : ddns version : 2.8.2-52
174637 : uci configuration:
ddns.xxx_xxx_ipv4.cacert='/etc/ssl/certs'
ddns.xxx_xxx_ipv4.check_unit='minutes'
ddns.xxx_xxx_ipv4.domain='xxx.xxx'
ddns.xxx_xxx_ipv4.enabled='1'
ddns.xxx_xxx_ipv4.force_unit='minutes'
ddns.xxx_xxx_ipv4.interface='wan'
ddns.xxx_xxx_ipv4.ip_network='wan'
ddns.xxx_xxx_ipv4.ip_source='network'
ddns.xxx_xxx_ipv4.lookup_host='xxx.xxx'
ddns.xxx_xxx_ipv4.password='***PW***'
ddns.xxx_xxx_ipv4.retry_unit='seconds'
ddns.xxx_xxx_ipv4.service_name='dynu.com'
ddns.xxx_xxx_ipv4.use_https='1'
ddns.xxx_xxx_ipv4.use_ipv6='0'
ddns.xxx_xxx_ipv4.use_syslog='2'
ddns.xxx_xxx_ipv4.username='xxxdynu'
ddns.xxx_xxx_ipv4=service
174637 : verbose mode : 0 - run normal, NO console output
174637 : check interval: 600 seconds
174637 : force interval: 4320 seconds
174637 : retry interval: 60 seconds
174637 : retry max count : 0 times
174637 : 'SIGTERM' was send to old process
174637 note : PID '5803' terminated by 'SIGTERM' at 2024-12-30 17:46
174637 : last update: 2024-12-30 17:36
174637 : Detect registered/public IP
174637 : #> /usr/bin/nslookup xxx.xxx >/var/run/ddns/xxx_xxx_ipv4.dat 2>/var/run/ddns/xxx_xxx_ipv4.err
174637 WARN : NO valid IP found
174637 info : Starting main loop at 2024-12-30 17:46
174637 : Detect current IP on 'network'
174637 : Current IP '112.199.240.81' detected on network 'wan'
174637 : Update needed - L: '112.199.240.81' <> R: ''
174637 : Force communication via IP '112.199.240.81'
174637 : #> /usr/bin/wget --hsts-file=/tmp/.wget-hsts -nv -t 1 -O /var/run/ddns/xxx_xxx_ipv4.dat -o /var/run/ddns/xxx_xxx_ipv4.err --bind-address=112.199.240.81 --ca-directory=/etc/ssl/certs --no-proxy 'https://api.dynu.com/nic/update?hostname=xxx.xxx&myip=112.199.240.81&username=xxxdynu&password=***PW***'
174638 : DDNS Provider answered:
nochg
174638 info : Update successful - IP '112.199.240.81' send
174638 info : Forced update successful - IP: '112.199.240.81' send
174638 : Waiting 600 seconds (Check Interval)
175638 : Detect registered/public IP
175638 : #> /usr/bin/nslookup xxx.xxx >/var/run/ddns/xxx_xxx_ipv4.dat 2>/var/run/ddns/xxx_xxx_ipv4.err
175638 WARN : NO valid IP found
175638 WARN : Get registered/public IP for 'xxx.xxx' failed - retry 1/0 in 60 seconds
175738 : #> /usr/bin/nslookup xxx.xxx >/var/run/ddns/xxx_xxx_ipv4.dat 2>/var/run/ddns/xxx_xxx_ipv4.err
175738 WARN : NO valid IP found
175738 WARN : Get registered/public IP for 'xxx.xxx' failed - retry 2/0 in 60 seconds
175838 : #> /usr/bin/nslookup xxx.xxx >/var/run/ddns/xxx_xxx_ipv4.dat 2>/var/run/ddns/xxx_xxx_ipv4.err
175839 WARN : NO valid IP found
175839 WARN : Get registered/public IP for 'xxx.xxx' failed - retry 3/0 in 60 seconds