May iba't ibang ways po para mafix ang bootloop issue, pwede pong iformat/factory reset using recovery, if you back up your firmware and your phone is rooted pwede irestore via custom recoveries, kapag hindi pa din po mafix need na po i-flash amg stockrom gamit ang flash tool, spd upgrade for spd chipset, sp flash tool for mtk devices, qulacomm tool for qualcomm devices and so on, depende po sa chipset ng isang device