Yes, I have Google too, but this kernel doesn't work on my card.
Why when you're asking for help, people think you don't know anything about cards and computers ? ...
Also, I don't have YSMenu on my card.
Okay then, with that little "thanks for trying to help me, but it didn't work", I'll desist from trying to assist further.
The link I provided you took all of about 30secs-1min using Google . If I owned the flahcart you've got, I'd be absolutely staggered if I was unable to locate previous firmware release somewhere on the net !! But you're computer savvy and know all about flashcarts etc, so you'll find it.
I've been looking into designing a small casing in the back of it actually, trying to integrate another 2230 M.2 slot along with as small a USB-C dock I can find to sort of make a plug and play M.2->USB expansion myself