Hi !
So i'm actually connected with the DGA4130

What i said above is working :
Replacing :
option vid '835' with your ISP Vlan ID
option username 'xxxxxxxxxxxx-101331@00000.agcombo.unica' with your username
option password 'alicenewag' with your password
Should make you connect to your ISP with PPPOE
i also changed the
DNS related to my ISP at the top of the file.

i'm synch at 80/17 wich is the same as my ISP box (also with a BCM63138)
I have my ISP Livebox4, a BT HH5A flashed with LEDE/openwrt, a Huawei HG612. from higher synch to lower :
DGA4130 and Livebox4 (80Mbits)> HG612 (78Mbits) > HH5A (77Mbits)
i'm at 301 metter of the cabinet.