Make sure you don't have nested matrix folders. If the file isn't at the correct location on the SD card nothing will make it load.

I don't know which lake/lakes you downloaded but look for a file named DATA.HWR and depending which lake you got there will also be 1 or multiple files that end in .HT. Take a blank card 32gb or smaller and create a blank folder named MATRIX. Copy and paste the Data.HWR and any .HT files to the folder. Boot your unit completely then insert the card. You will get an "Encryption message " if the card is not encrypted already. Remove the card then reinsert. It will ask you if you want to load the data, then just follow the prompts. It will load your waypoints and tracks. You can remove your card since everything will now be on the unit.
I just found out recently that he actually has a gpx file for the Solix units. He used to only have the .HWR and HT files for the Core/helix units.

I just remembered his files come zipped. Unzip the file to a folder on your computer and NOT the card. Then follow the procedure I described above.

I’ve had a similar issue. Helix 10 SI. My lanes just show up as very very tiny dots. Lance has gotten in phone and tried to help me to no avail. Credit to him. Standup guy.

Yeh,
Something that's a problem on my HDS Live-12 units also, especially using the bottom slot. Any card, waypoint, mapping or aerial maps. Using them in my projects, I often just rotate use of the slots.

That's the default view for trails. You have to go into the WRT screen, find the lane and change the view to the solid line and color you want.

+1
This has been discussed so many times.

Humminbird units have a setting called Saved Track Defaults that you edit track characteristics ( i.e. Line=Bold, Color=Black).
which you must do BEFORE you import any tracks. The settings ONLY apply to new track imports, NOT existing tracks).

For existing tracks, you must edit the track like Burton stated.