For hard-bricked Qualcomm devices (many Xiaomi, OnePlus, Realme), you can use (Emergency Download) with the official QPST tool from Qualcomm’s website—not a repack. However, this requires authorized Mi or Oppo accounts for modern devices, making it not truly universal.
A commonly used tool specifically for Samsung devices to flash official firmware. Security Warning How to Hard Reset Android Phone with Computer For Free ! For hard-bricked Qualcomm devices (many Xiaomi