There’s a stack of issues with the current state of the SDK, and board definitions for this module currently.
The decision to drop the external flash memory has made it very difficult to adapt the matter application samples that are one of the primary draws of this product.
As far as I can tell, even basic peripheral support is currently limited as nobody has written or ported drivers here yet.
This is untouched frontier territory to explore, and maybe even a blessing in disguise, as having a cheaper, but slightly more constrained design space still has its merits.
But in general I’m pretty frustrated with this product.
The community has been able to make a bit of progress in using these, but I know a bunch of us also have boards in what is currently an unrecoverable state, as clear instructions on how to properly clear the protection of the memory and mass erase the Flash to restore the MCU boot setup are not yet available.
This RRAM is cool, No bulk erase or anything close to the PITA for Flash and It’s non-volatile like flash. Probably why reading and writing will be different.
Bomb-Diddly YO! 
PJ 