Why do you say you (quote : ) "can't use CPU only" ? This is exactly what -D 1 does (with support from your CPU OpenCL driver).
BTW: it's also possible to use hashcat-legacy - formerly called "cpu hashcat" or "hashcat cpu" -- for bcrypt (but of course it's not recommended since it was replaced by hashcat 3.00)
BTW: it's also possible to use hashcat-legacy - formerly called "cpu hashcat" or "hashcat cpu" -- for bcrypt (but of course it's not recommended since it was replaced by hashcat 3.00)