It's the time for a new major Recalbox update, the 7.0!
For those who don't know what is Recalbox, it is a famous OS for retrogaming developed by passionate players and you can install it on Raspberry Pi of all generations and x86/x64 and even now on Intel NUC family!
More than 1 Year of work...
It happened to me too, I tried to change fw and restore it by many way and so currently I should be at 10.0.4 but console is stuck at Nintendo logo then black screen.
I hope you find solutions!
Then just use official SDK Tools
Didn't saw the entire post.
To use it onto yuzu, you need keys that aren't available yet or you should unpack it with SDK tool to repack it with hacpack