6.28 disabled the SFP on my CCR1009-8G-1S. Downgrading back to 6.27 let it work again.

I tried this:
/ip dns
set udp-packet-size=768 cache-max-ttl=15m
But I get a "expected end of command" error.
Where am I going wrong?

Why wouldn't it work? It will work

Well, to be fair. I have a RB153 that wont reset. Obviously it doesnt have the hole, but the jumper will not reset the pw either

You can't reset password using jumpers. http://wiki.mikrotik.com/wiki/MikroTik_Password_Recovery Yes you can. Short the s1 jumper. Power cycle the radio. On boot it will reset the software to the install and reboot again on its own. When it comes back up, move the jumper back and login with no pass...

What if this doesnt work?