The already “cracked” must be netinstalled,
the others protected from at least default firewall rules
http://forum.mikrotik.com/t/buying-rb1100ahx4-dude-edition-questions-about-firewall/148996/4
and access service disabled on WAN and active only for internal IPs
DO NOT direct update to 6.47+, first update to 6.44.6
https://download.mikrotik.com/routeros/6.44.6/routeros-mipsbe-6.44.6.npk
Inside are some particolar procedure to remove junk from routerboard
Also going directly to 6.47+ you risk to lose user and password
because MikroTik on successive versions change the database format where username and password are store
also warning because the bridge format change from master/slave mechanism to auto-switch all-in-bridge
the 6.44.6 automatically convert old format with new, but keep hardware offload off and fast forward off
after upgrade to 6.44.6 you must past on terminal:
/int bri set [find] fast-forward=yes
/int bri port set [find] hw=yes
6.42.10 is the last version where superchannel can be selected (licence or not),
frequency-mode can be only “regulatory-domain”
if some of your device are wireless, after that version,
if you do not set before update some counter-measures,
your tx power on device are dropped accordingly nationals rules (and what you are set on antenna-gain)