High Risk of "Bricking": This is the biggest danger. If you put the file on a corrupted USB drive, use the wrong file system (must usually be FAT32), or—worst of all—unplug the TV while the loader is running, you will permanently destroy the TV's software. The TV will not turn on again.
Confusing Versioning: Philips model numbers are complex. A file for model 55PUS7805 will not work on 55PUS7806. Installing the wrong version can cause hardware malfunctions (e.g., disabling Wi-Fi or ruining the backlight calibration).
Warranty Void: Manual firmware flashing often falls outside standard warranty terms. If you brick the TV while manually installing a .pkg file, Philips service centers may charge you for the repair.
1. Overview
Your TV is stuck in a boot loop.
New HDMI 2.1 features (4K@120Hz, VRR) are not working and the OTA update failed.
Philips technical support explicitly instructs you to do so.