I wrote about the fact that my card compatible and even faster than class 10 memory cards does not work in 70mai and the same card works without any problems in the old (already several years) car recorder. 70mai technical support responded after a month (what a reflex!). Here's the answer:
"Sorry for this inconvenience, the memory card standard of our device request Class 10. And the memory card should be replaced after long term use.
You can replace a new card to solve this problem. (32G SAMSUNG Memory Card will be enough). The reason why we recommend this card is that we didn't receive fault feedback about this card yet."
I spent a lot of money on buying a better 64 GB memory card (the specification says 70mai dash cam pro supports 64GB class 10 or higher) - support 70mai as a solution offers me buying a 32GB Samsung memory card?!?!?!?! I'm in shock! 70mai cheats on its users! 70mai does not write on its website that the device only works with Samsung 32 GB cards!
This is the first and last 70mai device I bought !!! I demand from 70mai to take this recorder from me and give my money back !!! Fraudsters !!!