What is the (e.g., stuck on logo, want to install Play Store)? Which region/ISP is the box from? Do you have access to the internal motherboard , or
Some ISP versions have locked bootloaders that prevent unofficial .zip files from being installed. Are you trying to fix a boot loop , or
The model number has several internal hardware revisions. The firmware for a unit manufactured in 2015 may not work on a unit manufactured in 2017. Flashing the wrong version can cause irreversible hardware failure.
If the box is "bricked" (won't boot), developers use a connected to the internal motherboard pins to push the firmware manually. ⚠️ Important Warnings