<p style=”text-align: left;”>From my previous experience only settings which are in administration / dsl settings can be easily changed plus speed cap, when I tried change something else simply doesn’t work…</p> Not sure if all because of fw or could be that broadcom blocked some as well.
That was my thought, I believe Telnet commands are intentionally very limited for these Diagnostic/debug firmware’s. 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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