I have found a good workaround to the problem simply modifing the two lines in the file:

/usr/lib/engima2/python/Screens/ScanSetup.py

in the following way:

the following lines ...

# blindscan sat
self.scan_sat.bs_freq_start = ConfigInteger(default = 10700, limits = (10700, 12750))
self.scan_sat.bs_freq_stop = ConfigInteger(default = 12750, limits = (10700, 12750))

have to be modified in the following way ...

# blindscan sat
self.scan_sat.bs_freq_start = ConfigInteger(default = 10700, limits = (3400, 12750))
self.scan_sat.bs_freq_stop = ConfigInteger(default = 12750, limits = (3400, 12750))

When you perform blind scan in the Ku band there is substantially no difference. You have just to remember, if you want to select a different range, to select it within the 10700-12750 range.

To scan in the C band you can now change the limits, since the firmware now allows the modification, by inserting values within the range 3400-4200.

I still do not know what can happen if I wrongly select value outside the LNBs range.

While I am still waiting for a new firmware this workaround is working well for mixed C/Ku band users.

Paolik65