有些序列号在琴头的后面，有的是印上去的，有的是贴上去的，有些是直接放一张小卡片在琴盒里面，有些会在贴在共鸣箱里面！ Hi Leon, we have been sorry you've not had the best encounter. Be sure to signal out from your application, sign back in again and return to settings. Set the most video quality to the bottom and try once more. If The difficulty persists please uninstall the application and https://buypowertoolsset.com/product-tag/buy-vessel-tools/