HTC Desire Duo 820s failed to factory reset!

Hi, I need some experts here to see what else can I do? Many thanks even solved or not solved suggestions.

Issue: when ever i used "factory reset" in the Setting menu, my phone will rebooted but not erasing and go straight to Bootloader page.

What happened: my stock rom was 4.4.4. And i downloaded Taiwan stock for 5.0.1. While using flashtool, i forgot to skip 2 files (i think) that should not be selected before running the firmware upgrade.

The phone still can use as normal but i wanted to reset my phone with factory reset to have it totally clean BUT FAILED.

I know i had broke something. Following is what will appear when I boot into Bootloader page:
*** Software Status: Modified ***
*** LOCKED ***
LK-1.01.0000 dirty-41077e9f

When I boot into dwonload mode, it appeared...
*** LOCKED ***
htc_a50ml XA S-ON
Sep 25 2015, 12:28:06 (626611)

When I select System Info from download mode page, my Serial No. is correct but IMEI is 000000000000000.

I downloaded the 4.4.4 and wanna flash back but flashtool can detect my phone connected but failed to update! I have tried all way with ADB to grep the inlock code, checked HTC site and returned my unlock code was error. Used fastboot commands to grep and write parameters. All done.

I wonder can I get some good advise to resolve this. Thanks.

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