i have no DLM, but my line is VDSL, yours is ADSL, so I can't exactly test for you
about different releases the adsl_phy needs to be from the same SDK version [open source firmware?] of several other accompanying components, I PM'd johnson a page full of that kind of stuff that I stumbled upon on google, don't know what was done on the x1 so let's wait for his answer
i don't think x1 performs how it was seen as it's used on the 3925, leaving that aside the next adsl version that im curious about is w1
from aajz.16 pdf
ZyXEL VMG1312-B10A & VMG1312-B10B
Bootbase version: V1.63 | 02/01/2016 15:12:03
Internal Firmware version: V1.00(AAJZ.16)C0
External Firmware version : V1.00(AAJZ.16)C0
Kernel version: 2.6.30
DSL mode code version: A2pv6F039v
DSL driver version: d26a
WLAN code version: 6.30.102.7.cpe4.12L06B.0
3G dongle WWAN package version: V1.16
APP agent version : 1.0.1
aajz.14
Bootbase version: V1.63 | 02/01/2016 15:12:03
Internal Firmware version: V1.00(AAJZ.14)C0
External Firmware version : V1.00(AAJZ.14)C0
Kernel version: 2.6.30
DSL mode code version: A2pv6F039v
DSL driver version: d26a
WLAN code version: 6.30.102.7.cpe4.12L06B.0
3G dongle WWAN package version: V1.16
APP agent version : 1.0.1