I carried out a bb1 and bb2 manual update (copy and replace via dopus) with pcmcia cf, after help from mfilos and system stability has returned and unarc is back to working

One thing i don't understand is the probs i have installing mui 3.8 which gives me a guru failure 10% of the way into the install.
I would like to install mui but do i need to find a more recent version than 3.8? Is it clashing with OS 3.9 and bb1+bb2?