Wasted the last hour trying to figure out why I was having issues updating my gps.
Turns out it was web filtering. Garmin uses regular http calls to download the update components. This worked for some of the smaller pieces but larger files (some as large as 800MB) were failing (logs indicated md5 mismatches). After much head scratching I realized UTM was added since the last time I did an update.
I disabled both IPS and web filtering as snort was slowing down the download. With these two disabled the update completely successfully.
One would think in this day and age garmin would be using https calls (which are excluded from web filtering by an exception).
So something to keep in mind if you have a nuvi or zumo and are having issues updating.
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