Help configure Ubiquiti EdgeRouter Lite with PPPoE and VLAN

I am having trouble configuring my ERL for Slingshot UFB that requires PPPoE and VLAN tagging. Would appreciate your wisdom that helps me tame this beast.

My endeavour so far:

Upgraded to V1.7 firmware - working fine as I can log in and access its functions through the new web-based UI

Tried Andrew's (Aredwood) config file but got error message: Upload failed

Tried to configured one PPPoE WAN port with two bridged LAN ports via Wizard tab: no luck - cannot log back in after reboot. I did change the ethernet cable from Eth 0 to Eth 1 after reboot. When tried to ping this ERL from my Mac, it shows inconsistently with either 'host unknow' or 'time-out'.

Any tip on what the next step is I may take? Am I not doing the right thing or maybe the hardware has been damaged (I did a few hard-reset during the past couple days)?

Apology for those rookie questions and thanks in advance for your kind support. I searched across the forum but couldn't find any instruction that I can follow.