Finally got some spare time to give it another session (three months since the last one passed already?!) now with 3.8.6 Turris OS.
I believe I’ve seen this thread on Mikrotik site before, I see it got updated a bit since summer, almost forgot about it, thanks for reminder. I will definitely read that.
I’ve already tried ‘phy-sfp-noneg’ mode with PPPoE back then, tried it today as well, so far the result is the same: eth1 interface goes up, yet SFP’s green LED itself still blinks as it’s trying to sync (as it seems per attached document attached when SFP arrived).
As for EEPROM contents, I’m not that much into that to give you a qualified answer, yet I remember when modem modules integrated into home routers/gateways needed some closed source binary blobs to be loaded during boot, otherwise they can’t be used properly.
As @andre suggested, I’ve reached Versatek by end of August and asked about software availability and ADSL2+ features and such; response was these things and their availability is some-what limited (don’t know it it mean hard-coded) to chipset<->telco’s cooperation, so they don’t mention these that much by themselves.
Not sure if that means a dead end for me for a while (ADSL, remember) or not. I think my next step will be approaching somebody near me, who has VDSL to give another try.