There are usually two types: first and second generations:

The official website of the first generation line states that it is impossible to diagnose all Volkswagen Group models of 2019 and later. The main reason is that the communication protocol of the first generation line is too old and cannot support CAN-FD communication of some newly designed modules of new models, especially the engine ECUs of the National 6 models., such as the Bosch National 6 engine computer MG1/MD1 series. Although the first generation line has limitations, the price is still very friendly.
All lines using the 19.63 Chinese version of the program, no matter what kind of shell, are first-generation lines and do not have second-generation line functions.
19.63 The Chinese program is a special version. It is the highest Chinese version of the first generation line and no longer indicates that it has expired. When the program was installed, the first pop-up window said,”This version only applies to the first-generation HEX-USB+CAN diagnostic connector produced by Ross-Tech.” That is to say, 19.63 Chinese programs can only use the first generation line, but lower versions of 16.8/17.1/18.2/18.9/19.61/19.62 Chinese programs can support both the first generation and second generation lines. 20.4 Chinese programs can only support the use of the second generation line at the beginning.

The test type of the first generation line main control chip ATMEGA162 on the official website is: HEX-USB+CAN. Thanks to the foreign god Kolimer for releasing the fully cracked file for free. The data cable of the old version of the 162 chip can be upgraded to a maximum of 19.63 Chinese program or a maximum of 23.31 English program by swiping the firmware. The cable lock problem was also solved by the Great God. Cables with updated firmware can be directly burned and repaired through the USB port.

A generation of functional imitation line main control chips may be NEC D79F8513A, HL008Arm or STM32F105. The communication stability is not as good as the official website 162 chip solution, and the old version cannot be upgraded.

The second-generation line was released on the official website around 2015 and can support diagnosis of the latest models. The shell is marked with “HEX-V2” and the vcds test type is HEX-V2. But please don’t think that the one with HEX-V2 written is the second-generation line. There are some unscrupulous manufacturers who put a first-generation chip solution into the second-generation shell and pretend to be the second-generation line. The market price of the second generation line with true second generation functions is about 400 yuan, and the sustainable upgrade will be slightly more expensive. The so-called second-generation line within 100 yuan is basically a second-generation shell set for each generation and has no second-generation line function.
Official website second generation line main control chip STM32F405 The test type is: HEX-V2
The second-generation imitation line main control chips may also be STM32F415, STM32F429 and STM32F427.