fastboot bootloop

create folder c:\rom
extract fastboot rom to this folder (use 7zip)
download this and copy these files (adb.exe, fastboot.exe, AdbWinApi.dll, AdbWinUsbApi.dll) to folder

https://androidfilehost.com/?fid=10763459528675586130

open fastboot mode, connect phone
run flash_all.bat file and wait until phone start