Xt1250 gsm doesnt work finland

So, i've been trying to help @Wile_e with his xt1250 let me start from the beginning.

he bought an XT1250 for Cellcom, He wants to use GSM while he is on Finland and Wants to use CDMA on verizon on USA.

Actually he is trying to use with Carrier Saunalahti the carrier uses 900/1800/2100 GSM bands and those are supported by Droid Turbo/ Moto Maxx.

For some reason when he pops in the sim card he says it cant found any networks, but he puts it in on a RAZR I and it works.

I made him look into Global mode and GSM/LTE, also nothing.

First thing i made him do was, Unlock the bootloader.

Then i made him install the unbranded Firmware for XT1250.

He did that, nothing changed, no networks detected.

Then i made him flash droid turbo radio, same nothing happened and lost wifi, so, thats not a way.

so im thinking as xt1250 is closer to moto maxx, recommend him flash moto maxx kitkat radio, but im afraid it will lose the CDMA properties.

im also thinking into flashing full lollipop but that would make him not come back to stock xt1250 firmware due to gt.bin updating.

i also remember someone said that moto turbo firmware and radio had both options but im not sure.

what do you guys think will be a good solution?

invoking the help of @chazzmat , @Semseddin , @Skrilax_CZ