Unable to change reset address to 0x0.

I wanted to make airisc_core_complex to start fetching at address 0x0.
I've changed many 32'h80000000 values such as `START_HANDLER`, `ADDR_IMEM`, `MEMORY_BASE_ADDR`, `imem_haddr_r`, `last_addr_r` with no success.
When I changed the shadow PC `issue_pc_r` to 0x0, the processor stopped fetching.

Is there a way to change the starting address of this processor?