my zgemma 2s stuck on half boot, on stb red boot written stuk here
Is anything displayed on the TV when trying to boot ? If so your box is not bricked, it needs a clean reflash using a small (less than 8gb), good named branded usb stick.
Low level format the USB stick and use the rear port to reflash without anything else connected other than power and the usb stick.
Failing that, then this thread has instructions on how to flash via serial console.
Failing that then you will need to recover via jtag., again it is covered in this thread.
i had used 2gb usb. and tried many images, only boot logo show on tv screen. putty error i show in screenshot