@Lezil
Read this guide: [Only registered and activated users can see links. ]. I recall that QuickCure worked for a bricked 37x0 device for me some time ago. It's always worth trying it first before making custom cure firmware anyway, it won't harm the device further and may save you some time and effort, so also read [Only registered and activated users can see links. ] which is additionally linked in kunix's initial post.