Hi -- I recently had a problem with my new 68U router that required a rescue mode reset. The ASUS tech support had me install a fairly old firmware version (3.0.0.4.374.371). It works OK, but I am thinking of upgrading to Merlin's latest firmware version. I was cautioned by the support guy against upgrading firmware versions "too high or too fast". My question is: Is it OK to install Merlin's latest version, should I do an older version first? Do I need to do a factory reset after? Thanks in advance.