Hardware issue overheating while booting and fail to boot

[dukla2000]

The link in the Wiki regarding the recover button led to a great little tutorial on using a serial connection to access the board… which I will try once I find that serial console… Unfortunately, it contained no reference to what the recovery button does or extra steps that you will have to do. I have been curious about what that button will do, but without an official explanation (in a manual or something), I have been hesitant to press it. I hope it just resets the default hardware values (like a factory reset), has anyone used it before to verify this?

Ooops  

Corrected the wiki - try this now.

It should connect you via OTG to something low level on your board - a bit like flashing firmware on your mobile phone. Havent tried it myself, figure you have little to lose. Especially after 1 blink if you can see the SDcard from the other end of your OTG cable that would be hugely encouraging.

I have updated the wiki about the SPI jumper - again worth a shout IMHO just to eliminate any crud that may have happened to your SPI. (And far more useful than the github flash/erase page you linked: that requires your Rockpro64 to be running and so far we are not sure of that!) But again RJ45 lights give hope it has not stopped breathing yet!