Shattered pellet injection (SPI) is regarded to be the primary candidate for disruption mitigation in ITER, due to the penetration depth and assimilation efficiency. To support the development of ITER SPI technology, 3D modelling of SPI in the ASDEX Upgrade (AUG) tokamak was started to validate the effects of the mixed Neon pellet on disruption mitigation. Based on AUG H-mode experiments, nonlinear simulations with the JOREK code are carried out to study the effects of SPI on the thermal quench and current quench processes. The shard distribution is initialized based on lab characterization and impurity charge states are tracked according to OpenADAS data using markers to evolve impurities more accurately than by a coronal equilibrium assumption. The effects of different Neon content are compared to experiments based on various different diagnostics. Remaining discrepancies are addressed and further ongoing efforts to resolve these are discussed.