GXBB:BL1:08dafd:0a8993;FEAT:EDFD718C;POC:3;RCY:0;EMMC:0;READ:0;CHK:F3;SD:800;USB:8;LOOP:1
^ This is good, it means eMMC is fully erased (and the board is not bricked, it's simply missing software). You can now boot the board from an SD card .. as long as the SD card has a working u-boot in the correct places. The LE "hub" board image has everything needed although the catch22 will be that you're likely to hit the same problem with serial UART noise. Perhaps try writing the factory image backup written to SD and see if that's found (it might not be since it's an eMMC backup and S905 puts magic boot headers in different offsets for eMMC and SD) but even if it fails at booting into Android it might get you to a recovery console or perhaps the vendor u-boot console.