Thank you Ansuel
From what i can see just after the upgrade, it still added me this in /etc/config/network
config interface 'wan_ipv6'
option auto '0'
option proto 'pppoe'
option demand '0'
option password 'IPV6@alice6'
option ipv6 '1'
option peerdns '1'
option keepalive_adaptive '0'
option dns_metric '0'
option ifname 'wanptm0'
option username 'CP1720TAW02-101331@alice6.it'
option metric '10'
config interface 'ipoe'
option proto 'dhcp'
option metric '1'
option reqopts '1 3 6 43 51 58 59'
option release '1'
option neighreachabletime '1200000'
option neighgcstaletime '2400'
option ipv6 '1'
config config 'config'
it enabled the CWMPD daemon...
Telnet is working, but show as disabled in the gui (this was already reported by other members in previous versions...)
Looks like something didn't work when you checked the ISP ?