Chirp is not supported. Use the Radioddity software. It’s super simple to use. Make sure to “read from radio” first and save that file before making any changes. You may need it down the road to reset the radio back to stock, or fix other boo boo’s.
The QT60/5555n2 is limited to 5 memory channels. Kind of pointless they only offer 5 IMHO. I chose channels 41-45 so i didn't have to switch bands to go up to say 27.425 during band openings. What you could also do is reprogram one of the other dozen useless bands (like band A for example) with all your favorite freqs. Just delete 1 by 1 the stock freqs and replace with your favorites.
What i did with my QT40 was deleted the weather channels, then added in local VHF ham, fire, county rescue, murs, etc instead. Now when i switch to WX mode and hit scan it acts like a poor mans scanner. If you leave the weather freqs in there the scan feature is useless because it always stops on a WX freq. Just a heads up.