Thanks for the comentaries, guys.
It's incredible that I spent hours researching and didn't see a single simple video like this haha thank you. However, see what happens in my case. Even if turned off, the device starts with the factory firmware as soon as the USB cable is connected.
https://www.youtube.com/shorts/5S_2vVIJUac (Sorry for the blurry image)
Updating: After buying another batch of cables, I finally got a connection and can install firmware on the cardputer. For reference, it was this cable here. There is no specification, it is one of the cheapest you can find. With it, I just pressed BtnGo and connected. In fact, the S3's LED did not blink or light up at any time.
Thanks everyone for the comments, it was a long thread. xD
Maybe we can learn with types of cable doesn't work with cardputer and why they don't work after all. xD
@teastain Yes, it is. I work in information security, so I want to install it to do some tests, nothing to attack other people. I don't believe it attacked the device, at no point was the binary executed or installed on the cardputer yet. In fact, the project is open source and you can check it here: https://github.com/n0xa/m5stick-nemo/
@ajb2k3 Yes, I tested the first time this was suggested. In fact, the first cable I was using was just for charging a portable gaming console. Then I tried a few more, inclund cables for smartphones, external drives, etc. And I tested then on their specific devices, everything normal.
No idea why the cheapest one worked on cardputer, though.
Updating: After buying another batch of cables, I finally got a connection and can install firmware on the cardputer. For reference, it was this cable here. There is no specification, it is one of the cheapest you can find. With it, I just pressed BtnGo and connected. In fact, the S3's LED did not blink or light up at any time.
Thanks everyone for the comments, it was a long thread. xD
Maybe we can learn with types of cable doesn't work with cardputer and why they don't work after all. xD
@ajb2k3 Yup, I think this thread have (almost) all the possible methods of flashing the cardputer. Tried all posted here, the one on the FAQ, some I saw on other threads and Reddit (all very similar, just changing the order of pressing the buttons), some suggested on Github, etc. :(
@has-oliveira Tried multiple cables, no one worked. Did you used any specific brand?
@ajb2k3 Thanks, still nothing.
Thank you very much to everyone who commented and helped, but I think I'll stop here. It took so many tries that some of the S3 pins are starting to bend, even though I'm careful when removing/inserting the chip.
I think I could end up damaging the cardputer if I continue with this stress on the components. I must continue my studies with simpler devices like the Portapack Mayhem until further notice.
Thank you very much for your comments, it is a very receptive community.
@doko178 Tried that some days ago. At least it prevents the cardputer autostart, but nothing about download mode. Thanks for the help xD
@doko178 Thanks for the comment, doko.
Still nothing even on the device manager. Now I believe I have tried every single button-press combination possible :D
@ajb2k3 Yup, tried that button too xD
I'll with the multimeter if I can spot something wrong. If not, I will save some money for another Cardputer or something similar in the end of the year. I'm pretty sure that if I try to replace just the S3, I will mess with it. :(
@ajb2k3 Yes, tried 3 cables on different USB ports, with and without the USB hub I've mentioned.
@robski No problem, thank you for the help so far. Tried with the S3 disconnected, but no results.
@ajb2k3 Yes, tried that too. The closer to download mode I get is the Cardputer not autostarting when plugged. Maybe I'll need to get another. :(
@felmue Thanks for the comment, felmue! Already tried both ways. As commented above, if I start with the BtnGO pressed, the cardputer does no autostart, wich is progress. However, it doesnt start on download mode too. Both options and it still isnt recognized on the pc/notebook.
Just bought a multimeter, will start to look for damaged components on the board and the S3 pins. :/