I flashed my modem now, I got too curious.
Sadly there is no immediate benefit on my line, long term I may get benefit, perhaps lower error rates etc, but nothing immediate.
US attainable is around the same as before.
DS attainable has dropped by yet another mbit.
After 40 mins uptime 7 crc errors on DS 7 also on US. That would work out at approx 10 hour, 240 per day. On previous firmware before I powered down modem was averaging 300-400 per day.
for the curious I flashed this file.
bcm96368MVWG_fs_kernel_HG612V100R001C01B030SP06_unlockedgui-nobtagent