Extremely slow upload speed
Hi, im having a lot of issues about internet speed. I've bought this modem as brand new and when i connected it to the ISP line (TIM fiber FTTC, VDSL) it had connection instability, however the internet speed and ping was good but when looking at upload i can notice there's something wrong. I tried using every kind of firmware, resetting and configuring by reading thousands of threads with similiar problems but nothing worked... Even the last firmware (2.0.0 0.9 v6041.0 Build 220304 Rel.6349n) doesn't fix it, however the instability issue seems to be gone.
I also tried to get assistance by the ISP multiple times and both phisically and digitally tests have resulted in no issues, meaning that this problem could be caused by the product itself since my old modem doesn't seem to have any kind of those problems.
Here i link the speedtest Thanks in advance.