Surprise! Sprint’s not going to let any silly microSD card bugs taint the day of their big EVO 4G launch. Just hours after Sprint shops around the country started pushing EVO 4Gs to hungry customers, the carrier has issued its first OTA update for this device.

Before you get too excited: it’s a pretty minor one, being that its sole purpose is to fix the microSD card issues that were reported earlier today. Whenever you’re ready to get your itty-bitty-update on, just follow Sprint’s steps below:

Customers can immediately install the update manually by going to >Settings > System Updates > HTC software update on the EVO, then following the instructions as prompted.

Update: Like the Hero’s update, it looks like this update might block the only current known rooting method.