Cannot access Luci after following guides

My router is a TP-Link Archer A6 V2 (US/TW). Flash firmware and sysupgrade from here.

I am following this tutorial.
I tried running this command opkg install luci-ssl-nginx and the output is this:

root@OpenWrt:~# opkg install luci-ssl-nginx
Installing luci-ssl-nginx (git-20.161.73418-219f0ce) to root...
Downloading https://downloads.openwrt.org/snapshots/packages/mips_24kc/luci/luci-ssl-nginx_git-20.161.73418-219f0ce_all.ipk
Configuring luci-ssl-nginx.
root@OpenWrt:~#

After installing that, I can't still access the LuciGUI in 192.168.1.1. Also tried following this guide, https://openwrt.org/docs/guide-user/luci/luci.essentials, but same result.

Can anyone help me? Thank you.

Did you reboot?

Yes I did, and the situation is still the same

So I tried running this command I found googling: opkg list-upgradable | cut -f 1 -d ' ' | xargs opkg upgrade and this return this part (latter part was cut)

Collected errors:
 * pkg_hash_fetch_best_installation_candidate: Packages for wpad-openssl found, but incompatible with the architectures configured
 * pkg_hash_fetch_best_installation_candidate: Packages for luci found, but incompatible with the architectures configured
 * pkg_hash_fetch_best_installation_candidate: Packages for luci-ssl found, but incompatible with the architectures configured
 * pkg_hash_fetch_best_installation_candidate: Packages for luci-ssl-nginx found, but incompatible with the architectures configured
 * pkg_hash_fetch_best_installation_candidate: Packages for kmod-ath10k-ct found, but incompatible with the architectures configured
opkg: the ``upgrade'' command requires at least one argument

why am I receiveing this error message?