Soft Brick with Locked Booloader in Moto g3 XT1550 (Dual-SIM)

Deal all Great and Senior Devs specially @lost101 need yours extrem help
i was on rr rom 5.1 and later after that i have flash Stock Factory Firmware Image of same model via Fastboot
i was successfully booted and also received the MM update so i had downloaded it and install it after final step to reboot i was stuck on unlock boot loader warring image so after seeing many threads i have flashed Stock MM Factory Firmware Image of same model via Fastboot as i wanted to sell this phone so i have tried to relock the boot loader so i have tried

fastboot oem lock begin
fastboot flash partition gpt.bin
fastboot flash bootloader bootloader.img
fastboot flash logo logo.bin
fastboot flash boot boot.img
fastboot flash recovery recovery.img
fastboot flash system system.img_sparsechunk.0
fastboot flash system system.img_sparsechunk.1
fastboot flash system system.img_sparsechunk.2
fastboot flash system system.img_sparsechunk.3
fastboot flash system system.img_sparsechunk.4
fastboot flash system system.img_sparsechunk.5
fastboot flash modem NON-HLOS.bin
fastboot erase modemst1
fastboot erase modemst2
fastboot flash fsg fsg.mbn
fastboot erase cache
fastboot erase userdata
fastboot oem lock
fastboot reboot

all the commands was showing okay while flashing
also boot loader got locked on final fastboot reboot i stuck on boot loop :crying:
and now I can only get into Fastboot mode .but I can't flash anything because the bootloader is locked. and I can't unlock the bootloader because I can't toggle the stupid "Allow OEM Unlock" setting.
please don't tell to visit service center its boot loop image showing unlock boot loader warning
pls help all great devs if their is any solution
thanks in advace

Download from this link