You can use it freely after updating software to LAUNCH X431 V+ X431 PRO3. After we activate the authority for you, you can register on Launch official website. When you receive X431 V+ X431 PRO3, please provide us with your serial number,the country and the langue you are going to use for activation. Open up the launch and read the MPU on board 'W77LE58' inside you will find the serial number and u can change it to whatever you want, if you can't do that, just send me your serial number and the file, i will edit it and send back to you I use TOP programmer but anyother programmer will do, beeprog etc. Hey guys, here you will find how to change a serial number on most x431 devices, i don't know about newer ones but i have been able to change and update the serial number of one gx3 and another x431 tool today. In the archive there are 3 folders ( 96859_v22.37, VEHICLES_09.2016, New Folder ) and 2 file ( com-cnlaunch-easydiag, the X-DIAG_PRO3_V3.09.015 ) Items from 2 to 5 minutes, such as in the old method.