Nokia 1.4: Loader |best|

| Problem | Cause | Recovery | |---------|-------|----------| | Device dead, no USB detection | Corrupted FDL1 in boot1 | Reflash via testpoint + SPD ResearchDownload | | Stuck in flash mode (USB 4011) | Invalid boot chain, FDL2 missing | Send correct FDL2 using sprd_flasher or libusb script | | Boot loop after unlock | Modified boot without dm-verity disabled | Patch vbmeta (avb_custom_key) or flash stock boot | | Fastboot not recognized | Wrong driver (Unisoc vs Android) | Install Unisoc USB driver 2.0.0.7 and use libusb filter |