this picture I took after the frequency adjustment in the setting, on the LF side appears or regular background, but the LF everything is inconsistent, I need help
The B260 is only 50khz on the low side and 200khz on the high side. This is not a broad band transducer it cannot be used on other frequencies.
You need to go back into the transducer installation menu and choose:
HF: 200kHz
LF: 50kHZ
You will not get conistent results with that transducer if you are not using those specific frequencies.
Once you restart the system, you need to verify that your frequency control is operating at 200kHZ on the high frequency and 50kHz on the low frequency.
It does not really matter, you will not use any bandwidth. The unit needs to be set to 200khz and 50kHz. Any frequency that is not 200khz on the high frequency and 50khz on the low frequency you are not running the unit at peak capability