STK-L21 BD 1.0.0.82 General 9.0.0_r3 Huawei Factory Repair Unbrick Firmware [Board Software] [DownloadGSM.com] [DG]
STK-L21 BD 1.0.0.87 Huawei Factory Repair Unbrick Firmware [Board Software] [DownloadGSM.com] [DG]
Huawei Board Software. Try to Choose latest version of Board Software or according to your device. Can be use IDT or MultiDwounloader Software.