No cellular service problem on c6902 - Xperia Z1 Q&A, Help & Troubleshooting

I have a problem Xperia Z1 C6902 Unlocked bootloader.
Since yesterday every new rom that I try to install (like Ihackers 5.2, lolipops CM roms and another) I get no mobile service after flashing ,
I did all as required.
these only after installing the modem (C6902 108 baseband) with FLASHTOOL.
someone know why it Happens ?

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