I bought a raspberry pi 4, 4GB last year in July. And I think I got a broken one, let me explain:
I have 2 raspberry pi 1B, two pi zero, and 3 raspberry pi 3, and in total 30 or 40 SD cards I've used in the pis, cameras and phones. (most of them Sandisk)
I've tried almost all of the SD cards I had in stock, and none of them worked in the pi 4, even though they all worked in the other pis.
I was trying it and giving up, and so on. I tried again this week, and after so much SD card movement I finally broke the SD card holder. My bad. It's still under warranty but I'm pretty sure it's not going to be covered (unless somebody knows otherwise?
Anyway, I've never used it, and now it's like a brick. The only thing that could save it would be to change the firmware for a recent one where I can boot from the network (I have some other pis doing exactly that). But since there's still the stock firmware from last year in the EEPROM, I'm stuck.
So here's the question: Is there a way you can upload a firmware via the GPIO?
If you're about to tell me I need to boot up with the new firmware on a SD card only once, please read my post again.