no problem

Invalid memory fetch (UC_ERR_FETCH_UNMAPPED) occurs when the script tries to access (read/write) to a memory address that hasn't been mapped yet, so you should debug the script to find that

strange, can you provide the command line you used? the script works perfectly fine for me with the firmware downloaded from this : https://archive.org/details/Draytek_Vigor2912_3.8.12_71207 Note that for different versions of firmware, the offsets in the script may vary