Latest distribution is always found at http://www.specnext.com/latestdistro/
This file contains all the files required to boot your ZX Spectrum Next 2A board. Simply extract the contents of the .zip file to the root of a FAT32 SD card and it should work. It contains the NextOS v1.91
The file includes some games and demos for the Next.
Next SD Card files v0.3 – Download now (1.2Mb)
Credits: Article image of cards piling up by MrGAWN