Well they all say RTFM.... and truly did not.
The v1.8.x firmware needs this SRAM to write to the SD card.
Mine was the older HxC that does not have the needed SRAM, so I cannot use firmware above v1.7.x.
Downgrading the firmware to v1.7.x makes it write into the SD card again.
Should have RTFM in the first place.... in this case the release notes.
Just in case someone encounter this...