iphone stuck in recovery mode and itunes keep returning error 14

My iPhone XR has crashed when I tried to sync the XR with my new iphone 12 Pro. My XR was in a boot loop and there was nothing I could do. So I tried to update the software with itunes but this crashed. I managed to get the iphone in recovery mode but when I try to update or the recover then iTunes give me an unknown error 14 when the "progress bar" on the iphone while update was approx. on 30%.

I cannot boot the XR and Itunes cannot repair update or recover the phone because of this error 14.

I know the XR disk was rather full. Please advise..