I got Llama.cpp to work with BakLLaVA (Mistral+LLaVA 1.5) on colab.
Here's a working example that offloads all the layers of bakllava-1.Q8_0 to T4, a free GPU on Colab.
https://colab.research.google.com/gist/chigkim/a5be99a864c4196d5e379a1e6e280a9e/bakllava.ipynb
FYI, Colab has no persistent storage, and you cannot keep a Colab instance running for a long time. I guess it's on purpose for their business reason. You have to setup and download everything from scratch every time you run. Colab is more for demo/experimentation, not meant to run a server for production.
Just run it again.