[Q] Stuck in bootloop, unsure where to begin topic

I have a Kindle P48WVB4 (Kindle Fire HD 7" 2013) that was my brother's, and now it is stuck in a bootloop. I believe it did this in the middle of an update. I have done some Google searching and learned that Kindle Fire Utility and Kindle Fire Unbrick Utility will not help with the 2013 model I have.

Does anyone know if there is any fixes available for this model yet?