> As discussed in a chat, I tried SDR104 with my SDIO WiFi cards:
> 
> H3:
> - one slot worked flawlessly
> - one slot could load FW but failed to read status
> (with SDR50: both slots work)
> 
> M3-W:
> - both slots could not load the firmware
> (with SDR50: one slot works, one fails to load FW)

Update for my H3-ES2.0:

 - both slots could not load the firmware with SDR104
 (with SDR50: both slots work)

> The cards, however, were correctly identified as SDR104 and there were
> no tuning errors and no other SDHI related warnings.

This still holds true.