I do not know, and I do not own an LT-590, (nor a TH9000) but I would certainly be interested in finding out. The radios look identical inside and out. There are also VHF versions of each. The TYT units have been discontinued, but I really think they live on under this Luiton brand name. They must come from the same factory... just look at the difference in the quad-band units the TYT TH-9800 and the Luiton LT-9900 - same thing. Does anyone here own an LT-590? If so, try using Chirp to read it as if it were a TYT 9000, and see if it works. Inquiring minds want to know. Bigger question, does anyone want to blow $25-30 on a cable for an LT-590 and try it on a Midland 400? RT systems says the same "USB-29A" cable works on both the TYT and the Luiton, so... maybe on the Midlands? Of course, if you can, and do re-program the Midlands, they are no longer type accepted.