There is a known compatibility issue with the EZFlash Vi and specific 8GB micro sd cards. If the card is made by Kingston and manufactured in Taiwan, then your EZFlash Vi will get stuck on the booting screen. Any other size card, brand, or manufacturing origin will work just fine, including 2GB and 4GB sizes available on our site. As far as we know, it is an issue with the EZFlash card firmware, not the Micro SD Card. The EZFlash Team is currently working on a fix and should have it ready for the next update to their card. As always, we will keep you updated on important updates and will have the latest software available on our website DSCardWorld.
Thank you and hold on to your cards, a fix is coming.