Download your FREE Brazil Map from June 6th to July 13th 2014. I haven't tried it if it works, but I am not planning to go to Brazil in the near future anyway and I'm just sharing.
Here's what you get https://buy.garmin.com/en-GB/GB/prod11163.html
Here are the details:
Terms and conditions: Garmin.com is offering 1000 free Brazil maps for customers with compatible Garmin devices. Offer only available while stocks last. Only one download per person. The maps will be available to download from Monday June 6th 2014 to Thursday 13th July 2014. Fill in the form on the promotion page to receive an email containing a discount code. This discount code will enable you to purchase the Brazil map for Free for your compatible device.
Download requirements: The file size of this download and space required on device or microSD™/SD™ card is 450 MB. If this download does not fit on your device, data may be saved on a microSD/SD card (recycled microSD cards may be used to program map data).