Batter level is stuck at 20% even after full change.also the system shows that android nougat has crashed. Any Patch to fiz this.. Repairing software through xperia companion takes long and often stops in between.
I don't think a patch can fix such an individual issue. You'll need to perform a software repair using Xperia Companion. This will do a clean installation of the latest firmware and will also wipe your internal memory. Don't forget to backup using Xperia Companion, but preferably without adding apps or settings to the backup.
Follow the steps given in blue links, and keep us updated.
