Repair boot LG-F460L, Unbrick LG-F460L G3 Cat.6 : QHSUSB_BULK, Qualcomm HS-USB QDLoad

Dear all,

how Repair boot LG-F460L, Unbrick LG-F460L G3 Cat.6 : QHSUSB_BULK, Qualcomm HS-USB QDLoader 9008 ? Please help.
any idea, any tool, Please help.

Thanks in advance