Have you tried plugging it in and seeing if it turns on? Also, are you using the correct charger? If the same thing is happening twice something seems off.
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SBC Gaming is for Single Board Computer aimed to play video-games, also called Retro Handhelds
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Seconded. Check that it's actually charging.
I wonder if OP is trying to use a USB C to USB C cord/charger instead of a USB A to USB C cord. That's part of the reason I posted about adapters here the other day. I am not sure what percentage of devices officially support USB C to USB C charging.
It seems like the RG35XX-H uses a button not a switch like you'd see on the Powkiddy V90 for example. Devices like the RG280V that use a similar button can be powered on, even with the battery detached, as long it's plugged in. OP could eliminate a potential battery fault by plugging in and trying to turn it on.
I'm assuming there are no other signs of life like the power lighting up but that could narrow it down as well.
It might also be worth disassembling and looking for obvious faults especially if Anbernic isn't going to take another return.
tagging /u/wiltur@jlai.lu so they see this
Well, I tried everything, nothing helped.
I contacted Anbernic customer service, sent a video, and finally sent the console back for a refund...
What do you count as everything?