Mtk_gsm_sulteng_v1.3.8 The tool can bypass SLA/DA authentication for flashing and provides options to unlock or relock the bootloader. One of the most common uses for specific GSM binaries is repairing a phone that has lost its IMEI number or shows "Baseband Unknown." This often happens after a failed flash or physical damage to the device. This file can be flashed to restore the modem functionality. mtk_gsm_sulteng_v1.3.8