HMC767 I use ref 50M pfd 50 it can lock but if i change ref to 100M the pfd sitll choose 50M ,it can't lock,
when I use ref 100M with a divide by 3 it can lock the most frequency ,
if i use ref 150M with a divide by 3 it can lock all ,but some point need upgrate twice then it can lock .
Please refer to the recent response to your previous lock question as the answer here will be similar.
i did it as you said , but it still can't work