I can confirm I bought it from the official GL.iNet store. Also it doesn't have CN on the main page.
I managed to upgrade Adguard using [Script] Update AdGuard Home and I can access it via port 3000. But still no Adguard or VPN clients from the main interface.
Checking at the logs, I see
# logread | grep adguard
[...]
Fri Nov 15 13:23:38 2024 daemon.notice procd: /etc/rc.d/S99adguardhome: * Running script '/etc/firewall.vpn_client_deal_leak.sh'
Fri Nov 15 13:23:38 2024 daemon.notice procd: /etc/rc.d/S99adguardhome: ! Skipping due to path error: No such file or directory
Fri Nov 15 13:23:38 2024 daemon.notice procd: /etc/rc.d/S99adguardhome: * Running script '/var/etc/gls2s.include'
Fri Nov 15 13:23:38 2024 daemon.notice procd: /etc/rc.d/S99adguardhome: ! Skipping due to path error: No such file or directory
Fri Nov 15 13:23:38 2024 daemon.notice procd: /etc/rc.d/S99adguardhome: * Running script '/usr/bin/gl_block.sh'
Fri Nov 15 13:23:39 2024 daemon.notice procd: /etc/rc.d/S99adguardhome: iptables: No chain/target/match by that name.
Fri Nov 15 13:24:55 2024 daemon.info procd: Instance adguardhome::instance1 s in a crash loop 6 crashes, 0 seconds since last crash
I don't know if it's related or not.
I will try Debrick via Uboot - GL.iNet Router Docs 4 to see if it will solve my issue.