Hi,
I bought A800S too. I had a big expectations for this camera. Because of reviews on YouTube. Now i know, they was paid.
I created a dispute on Aliexpress with 70mai and i send them 4k non edited video. Quality is super bad and their answer:
Quality is ok, we don't see any problems here.
70mai A800S Video Sample (A800S quality, A800S review, A800S 4k video):
Please, stay away from 70mai company. They are scammers, banning ppl from forum when you write the truth about quality issues.
For this price you can buy better dashboard cameras, not this piece of crap from scammers company.
They are already ignoring A800S support section on their official forum.
Have a nice day & i hope i saved you some money.