If the board powers up (LED's come on) the device is not bricked (esp. for something booting from SD media). It can have software issues that disrupt boot, but it is not bricked.
Add ssh to boot params in exlinux.conf to force the SSH daemon to start. Add video=HDMI-A-1:1920x1080M@60D to stop the kernel defaulting to 4K60 modes the TV might not like. If you want us to do more than blind guess at the issue; attach a serial UART cable and pastebin/share the output from boot.
NB: You can also try: https://chewitt.libreelec.tv/testing/LibreE…ockpro64.img.gz