[Q] China Unicom 3G not working CM12OS - ONE Q&A, Help & Troubleshooting

Hi everyone,
I bought my OPO in China last december and I have China Unicom as Service Provider.
I have correctly installed offical CM12OS, but the 3G network is not recognized by the modem of the ROM.It goes only on the 2G Network.
It is the same that happened with CM11s, In that case I had to flash a modem("signed_modem_34g.zip") into the Rom and then it worked.
I tried flashing "signed_modem_34g.zip" on CM12S but I was stucked in the bootloop.
What could I do now to make the 3G working again?
Thank You so much for the support.

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