Upon reaching 20% battery, the feature limits background processing for non-essential apps specifically optimized for TCL UI, reduces screen brightness and refresh rate further than standard mode, and provides a "Hardcore Mode" that disables all non-essential data connections while keeping essential apps (Phone/SMS) active.
From user reports across XDA Forums and TCL community boards, the most frequent firmware problems include: Firmware TCL 30E
Unzip the downloaded firmware package on your computer. Upon reaching 20% battery, the feature limits background