I assume you have already done a proper Forum Search for your model number in case other people have already answered your question ?
If so and that didn't help then check out this thread: https://community.sling.com/thread/3300?tstart=0
Come back if it that doesn't help either.
1st : I searched for those 2 cable Tv boxs but I couldn't find anything.
2nd : on your post you said "The first thing is to make sure you try all the models associated with the manufacturer of your device, as most manufactures use similar code sets across their device range. Also make sure you select the ‘Other’ option under your manufacturer and try all the codes."
I did try all the Panasonic similar product but didn't receive any video signal !!
about the other device "HIVION" I didn't find anything in the website.
OK, a few points here.
1. If you are not getting a video signal that has absolutely nothing to with the Remote selection. It means you haven't wired it up correctly.
2. I couldn't find a TZ-LS300F although I did find a TZ-DCH 300. But no point in trying that until you get the video sorted.
3. I can find no trace of a HIVION. Are you sure it isn't Hivision ?
Thank you for contacting Slingbox Forum. I am sorry you are not able to access your remote on setup.slingbox.com. Also, it seems you are having no luck with an answer on our Forums.
If you would like, you can request that Sling Media research the remotes you need. Here is a link to get the instructions on how to do that:
Hope this helps with your issue!
Have a great day!
Sling Moderation Team