Before deciding to flash a noRSA bootloader or Patched CG31 from this thread:

[noRSA] Bootloaders for E8, Patched CG31 for E8

ALWAYS FLASH THE noRSA BOOTLOADER VERSION MATCHING TO THE BOOTLOADER ON YOUR PHONE. FLASHING AN INCORRECT VERSION MAY RESULT IN AN UNRECOVERABLE BRICK. UPGRADE BOOTLOADER ONLY BY FLASHING STOCK OVER STOCK.

FLASHING CG31 FOR 06.A9 / 06.AA / 06.AC ON BOOTLODAER 06.A3 / 06.A5 CAN ONLY BE FIXED BY UPGRADING BOOTLOADER TO 06.A9 / 06.AA / 06.AC.