Before flashing, try a simple factory reset (Settings > System > Reset). If that doesn't fix the boot loop, then proceed with the USB method.
Extract your downloaded firmware files. You should see files like allupgrade.bin , mboot.bin , or rom.bin . Copy these directly to the root of your empty USB drive. wisdom share smart cloud tv firmware download best
The Ultimate Guide to Wisdom Share Smart Cloud TV Firmware Downloads wisdom share smart cloud tv firmware download best
Ensure the drive is empty and formatted to FAT32. wisdom share smart cloud tv firmware download best