Thank you for the support. With 3ms delay the bruteforce is working OK. About the password. If I enter a wrong password in SFP module it returns an error. If I enter a password in QSFP and I try to write it, it just refresh the original values (without any error). Is this the normal behaviour?
Yeah some modules in case of wrong password just restore default value (immadiately or after restart). But you can also consider to write data with password with page access (128B) instead of full area (256B) because some modules requires re-entry password just before page write.