BRT-AC828 Let's encrypt authorizing issue

Hi,

I've seen several reports about this issue on the forum, but as far as I've understood there were other firmwares or models.

Any ideea how to solve this on BRT-AC828 with latest firmware? It's stuck for 5 days since reset.
I've reset the router 5 days ago to factory defaults and started reconfig but without success in solving this issue.

Thank you,