Profile 17a is the one recently approved that increases the available bandwidth from 8.5MHz to 17.6MHz, supporting a potential increase in data rates to 80Mbps downstream (based on BT's configuration, subject to the line characteristics).
This may indicate that BT has begun rolling out the update to their VDSL2 cabinets.
Could you post a screen shot of the Overview, DSL and Spectrum tabs from the DSL Information section of the Fritz!Box GUI?
At the moment, the home Hub is back on. I was using the new official firmware and snr started dropping from 6 (day time) to 4, and at night from 4 down to 2 which caused a resync. I might go back to the beta firmware which was at least a stable snr.
So at the moment no screenshots, but can give you some stats from a couple of days ago:
This is from the DSL Info:
Max. DSLAM throughput kbit/s 40000 10000
Min. DSLAM throughput kbit/s 20000 5000
Attainable throughput kbit/s 35888 13553
Current throughput kbit/s 35888 9984
Latency 0 ms 0 ms
Bitswap on on
Impulse Noise Protection 0.0 0.0
Signal-to-noise ratio dB 6 11
Line attenuation dB 10 -
Carrier record A43 A43
FRITZ!Box 198 2 11 542 2 26
DSL central exchange 8 0 0 0 0.14 0
I will let the hub run for a few days and go back to the beta firmware, then if you need any screenshots let me know