We use the simulation framework DREAM to study SPI-mitigated disruptions in ASDEX Upgrade. We have developed an interface to obtain realistic SPI shard distributions, either from statistical distribution functions or experimental data. In H-mode plasmas, used for SPI experiments, the bootstrap current plays a non-trivial role in the dynamics of the disruption and runaway electrons. We will discuss the bootstrap implementation based on the Redl-Sauter formula, as well as ongoing work and future modelling plans.