Use USBSafe.bin Method it will flash without any error
1: Short Boot Point And Connect To PC USB Port
1. FcSerialDrv: Install Drivers
2. Start Balong_USB_Downloader And and use E303 USBSafe.bin
3. Flash firmware.bin with Huawei Modem Flasher v1.6 It will give error on part 4
3b. Apply commends with Terminal:
at^godload
AT^SIGNVER=1,0,778A8D175E602B7B779D9E05C330B5279B0661BF2EED99A20445B366D63DD697,2694
5. Update WEB UI
6. HuaweiCalc: Calc V201 Code Via Imie
7. Put Wrong Sim Card And Enter Unlock Code
it's Done
Example: