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From what I understand, it is yearly series. For instance, Series 6 is newer than series 5 and so forth.
Sorry, there was a problem. Please try again later.Our TCL Roku TVs are categories into different series. Each series builds on each other. Our 4-Series features a 4K resolution and HDR10 support. Our new 6 and 8 Series also feature a 4K resolution and HDR10 support in addition to Dolby Vision support, QLED technology, etc. You can also visit www.tclusa.com/products/home-theater/6-series and scroll down to "Compare All Models" to see all models compared. Hope this helps! Thank you, TCL Customer Support
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