FCC unlock support for Latitude Dell 5540
Dell 5540 has the same Chipset/WWAN Modem combination like Lenovo X1C which is covered by
https://gitlab.freedesktop.org/mobile-broadband/ModemManager/-/blob/a729a92e1035dcdd13b46331c773f7b06c5b1b18/data/dispatcher-fcc-unlock/14c3
Script. I assume unlocking would work same way. I wonder how the magic VENDOR_ID_HASH
used in Script is built or found. Is there a way how this could somehow be built for Dell 5540? I tried having a look at Dell windows 10 driver. I guess the magic happens inside IntelWWANModemAuthenticator.exe but i am completely lost in doing further analyses.
72:00.0 Wireless controller [0d40]: MEDIATEK Corp. Device [14c3:4d75] (rev 01)
Subsystem: Dell Device [1028:5931]
Flags: bus master, fast devsel, latency 0, IRQ 17, IOMMU group 18
Memory at 6053800000 (64-bit, prefetchable) [size=32K]
Memory at 9e000000 (64-bit, non-prefetchable) [size=8M]
Memory at 6053000000 (64-bit, prefetchable) [size=8M]
Capabilities: <access denied>
Kernel driver in use: mtk_t7xx
Kernel modules: mtk_t7xx
Running it against existing script is not working.
cat /var/log/mm-fm350-fcc.log Requesting challenge from WWAN modem (attempt #1) Requesting challenge from WWAN modem (attempt #1) Got challenge from modem: 0xe486a481 Sending response to WWAN modem: 435141688 FCC unlock failed. Got result: 0 Requesting challenge from WWAN modem (attempt #2) Got challenge from modem: 0xe486a481 Sending response to WWAN modem: 435141688 FCC unlock failed. Got result: 0 Requesting challenge from WWAN modem (attempt #3) ...