Just as the title says, today the 3ds firmware has been updated to V8.0.0-18
check the change log below
Main changes for version 8.0.0-18U
Update released: July 7th, 2014
- Further improvements to overall system stability and other minor adjustments have been made to enhance the user experience.
check the 3ds V8.0.0-18 compatibility card here: dsflashcart
for using flashcarts on this new 3ds firmware. we have tested a few popular cards, such as r4i gold 3ds, supercard dstwo, these cards are still working, looks like the new 3ds system didn't block any card.
By the way, i would not recommend you always update to the latest firmware, because there will be a card can play 3ds games on the last or older 3ds version soon. but it might can not work on the latest version, so if you have a plan for it, you might do not want to update.
Do yourself a favor, don't buy crappy flashcarts.