Home Assistant Yellow green led flashing 8 times

Ran my Home Assistant yellow for three weeks with a load before I took the first step to migrate. Did a back-up of my existing system, shut it down, moved my Z-Wave stick to the Yellow and did a restore. Came up after the restore, I was able to log in and then it stopped with the both the yellow and red led on solid. Removed power and when I plugged it back in got red led on and green led flashing 8 times (SDRAM not recognised?).

Tried removing the NVMe and reseating the CCM4 no change. Any suggestions appreciated.

CM4108032 8GB RAM 32GB eMMC
Samsung 970 EVO Plus 1TB NVMe M.2 Internal SSD (MZ-V7S1T0/AM)
Zooz ZST10 700

I also have something similar, green led flashing 8 times, would also like to know what it means!