User blog comment:BuGgErHAX/3DS Hacking/@comment-5394692-20131028234513/@comment-20455465-20131029000046

Thanks for the support! Nintendo said that they patched all exploitable bugs in 6.3 and have not released any newer firmware in 6 months. 4.5 has a very exploitable bug that has already been used to run unsigned wich is located in the NVRAM DS User Settings. search smea on YouTube and find "3DS hack: unsigned code running on retail unit"