Boot Loop – Repairing a X43Z60 Fire Starter

I have a Kindle Fire. One day, I was stupid and I deleted a lot of things in the folder / system. Now it will not start anymore. No ADB, no fastboot, no nothing.

However, he always shows the static splash screen (with orange text "fire")

It never goes to the animated splash screen.

Can I install it in fastboot without cable or can I go into recovery mode?