The Qualcomm MDM9615M is the baseband chip used in the iPhone 5. It is a 28 nm LTE (FDD and TDD), HSPA+, EV-DO Rev B, TD-SCMA modem and allows for multi-spectrums, multi-mode LTE support. It is responsible for transmitting simultaneous voice and data transfer on LTE (provided the carrier has the infrastructure to allow simultaneous voice and data transfer.)
Right next to the Qualcomm MDM9615M is the Qualcomm RTR8600 multi-band/mode RF transceiver. The RTR8600 is paired alongside the MDM9615 to support various bands, including 5 UMTS bands, and over 5 LTE and 4 EDGE bands.
The firmware for the baseband chip comes in Mav5-X.XX.XX.Release.bbfw files (with X being the version). The BBFW file is just a renamed standard ZIP archive and contains a couple of .mbn files which are all digitally signed with a certificate from Qualcomm - similar to the iPhone 4S.
Looking at strings found in the baseband, this is based on the same source code base as used on older qualcomm chipsets by other manufacturers (like HTC).
Known Firmware Versions
1.00.16 6.0 (Build 10A405) 1.01.00 6.0.1 (Build 10A525) 6.0.2 (Build 10A551) 3.04.01 6.1b1 (Build 10B5095f) ? 6.1b2 (Build 10B5105c) ? 6.1b3 (Build 10B5117b) ? 6.1b4 (Build 10B5126b) ? 6.1b5 (Build 10B143?) 3.04.25 6.1 (Build 10B143) 6.1.2 (Build 10B146) 6.1.3 (Build 10B329) 6.1.4 (Build 10B350)
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