It is really totally unnecessary to update your system firmware to v4.5.0, if you are already between v4.1 - 4.5 no need because you will update your Emunand to v7.1.0 - 16E, the latest firmware, so basically you just rely on your Gateway Emunand all the time to use your 3DS/XL, not your system firmware, so there is no point whatsoever!
Well some people have reported issues with 4.1 and Gateway... may just be coincidence, but better safe than sorry I suppose.