(18-03-2021, 08:09 PM)amatronixs as per
i use sp flash tool
are you sure you download the right preloader build for your device? if so then disconnect and re-connect the battery, then try to power on your phone.
disconnect / reconnect the battery of the device then confirm if it's still totally dead or not
if still totally dead then try preloader from other builds and do the battery test until you find a matching preloader that'll power on your device