[Q] What's the difference between the XT1575 and XT1572 regarding system image?

I live in Germany and will soon receive my style, maybe tomorrow. My question:

There are several issues, that points to different system images of the XT1572 and XT1575. I assumed, that for example the lte channels (= modem) are the only difference, but there are some others, too. In an other thread, an user described a problem with using WiFi correctly, after flashing the system image of the XT1575 on a XT1572.

This would result in different roms, if development will start soon. Is this correct? Does anybody know, what's the real difference of the two devices regarding software/hardware? Are there different WiFi modules? Can you please support me?

I'll wait with rooting my device until I'll get some clearance about this (and maybe until M via OTA arrives).

XT1572 factory recovey image (Firmware)

Hello guys, I would like to Unlock my BL and root my device, but I'm afraid that I will be not be able to update to Android 6 by OTA.
So I was looking for some stock firmware or recovery image, in case I need to lock my BL or get back to stock.
I was thinking about Unlock BL, intall TWRP, do a backup, and than root. And case every thing goes wrong, I would need stock recovery so I can lock my BL again.
My device is Brazilan one 2 SIM, and XT1572.
The only site I founded the firmaware is this one http://www.phonandroid.com/forum/fla...e-t132486.html
and the dowload link is this one: http://www.filefactory.com/file/3jm5...LT_CFC.xml.zip

What do you guys think, should I take the risk?
Thank you!

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