Modem-related code in Mediatek framework?

Hello, friends
I'm still trying to port Lewa OS v6 kitkat from Coolpad F2 8675 (mtk6592 with lte+td-scdma modem) to my Thl 4400 (mtk6582 with wcdma modem only). For the last months we have some progress in this, but the trouble with modem is not completely solved for now. It works only in 2G networks both on sim1&sim2.
What we have done:
1. Putting all mount*.smali in services.jar from stok rom. This step fixes modem death after first reboot (coolpad has different partition structure).
2. Using all libs, binaries, modem firmware and mddb from stok rom (it really differ, there's 2-3 modem files in firmware and 2 files in mddb instead of only one in stok).
This steps makes cellular network partially working. But 3G is completely unworkable. If we insert sim of 3G-only provider (i.e. there's no 2G network), it search for network, register for about 3-5sec (we see it on signal level) and falls. If we insert sim with 2G support to 1st slot it can register in 2G network.
I think that we need to fix some modem-related code in mediatek frameworks. Where we should look for modem-related smali files?
I would be grateful for any help. Thank you.

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