20b | Firmware Tcl

Corrupt modem firmware partition. Fix: Re-flash the persist or nvram partition using SP Flash Tool (requires backup).

Black screen, detected as “MediaTek USB Port” or “Qualcomm HS-USB QDLoader 9008”. Fix: Use SP Flash Tool (MediaTek) or QFIL (Qualcomm) with correct DA (Download Agent) and Auth file . Auth files are TCL-proprietary and rarely leaked. Firmware TCL 20B