proscan

Model: Proscan PLT1077G Android: 4.4.2 Checked site for updates and found nothing. Checked sleep settings and it is as high as it can go (30mins). Less than 15mins and it shuts off (96%). Battery saver and calibrator were tried but still reoccurring. I've tried the safe mode method. It says...

I have a Proscan PLT9045K which is a Rockchip System running Android 4.1.1. Are there any upgrades out there that I can use for this?