Yo! People! Who among y'all is very very GoPro Hero4 savvy and knows all it's functions inside out, and has da time to sit in and teach me? On Tuesday afternoon perhaps. Cuz I'll be in Osaka for da Summer Sonic Music Festival and leaving on Wednesday morning?... 各位乡亲父老！这里有誰是很超级熟悉 GoPro Hero4，而有空闲可以教我的吗？请联络我！