Ok I followed the advice of everyone here and used
4.1U
cIOS-38 Rev14 as 249 (not used though, black screen)
Hermes cIOS v4, 223 as 38 merged 37
USB Loader GX latest version at time of this post, set to use cIOS 223 and Anti Error 002 on by default
and it works fine, except the USB mic...