XT925 modem files for XT926 for LTE

[nagim]

Hi,

I tried to search for it, but couldn't find an explicit answer (so please close or move this toipc, if it has been answered before).

I have a Verizon DROID Razr Maxx HD (XT926M), and I live in Europe.

Is it possible to make LTE work here by flashing the modem files from the international XT925 version (here we have LTE 800/1800/2600)?

Thanks in advance!

Sent from my DROID4 using XDA Free mobile app

 

[cmh714]

look for the radiocomm hack, I believe thats what you are needing

EDIT: Actually I dont think its possible.....we dont seem to have those radios in our device.....
http://www.gsmarena.com/motorola_droid_razr_hd-4971.php
http://www.gsmarena.com/motorola_razr_hd_xt925-4970.php

 

[nagim]

Yes, Radiocomm is for GSM unlocking in US.
I believe the SoC contains all the bands of RAZR HD variants, just locked. Maybe no one tried flashing the different modems.

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[MCP1]

Tried before and no luck

Yes, Radiocomm is for GSM unlocking in US.
I believe the SoC contains all the bands of RAZR HD variants, just locked. Maybe no one tried flashing the different modems.

Sent from my DROID4 using XDA Free mobile app

Yes, it is true the standard 8960 SoC is multiband/multitech and has all the antennas internally, but it is frequent the manufacturers order lots with some functionalities disabled to satisfy customer requests (Verizon).

I have tried to reuse the XT295 radio in the XT926 but no luck with LTE. But it was a long time ago...

 

[Zeljko1234]

Should be possible to reprogram SoC with flashing xt925 radio for correct region. I didn't try it and now I'm not in Europe anyway.

 

[nagim]

Should be possible to reprogram SoC with flashing xt925 radio for correct region. I didn't try it and now I'm not in Europe anyway.

That's encouraging, thanks! I might try it once my Maxx arrives and Kitkat is available for the XT925 as well.

 

[kabaldan]

There are different band specific power amplifier modules used in different Razr HD variants.
It's hardware difference, using different modem firmware is not enough.
Even Canadian xt925 can't be made to work on European LTE bands, flashing euro xt925 firmware won't magically enable it.
Your xt926 won't work on European LTE bands either.

 

[Zeljko1234]

Where did you find information about power amplifier?

 

[kabaldan]

Where did you find information about power amplifier?

You can see the band specific PAs e.g. in the block diagram (page 3) or parts list of the deep dive teardown by techinsights for Atrix HD that is available as pdf download (sorry, I don't have the link by hand as I'm away from home and my machines currently).
Razr HD is very similar and it's obvious that different region models are equipped with different PAs suited for different radio bands.

The same was true for older OMAP based Motorola phones. There were different HW variants of Milestone or Defy. Depending on the region where the device was bought, the device supported only certain bands. Although there was a baseband switcher included in custom ROMs (CM) which allowed to select any region specific baseband firmware to be used, if you selected baseband not matching your region specific HW variant of Milestone or Defy, you couldn't use some of the bands despite they were enabled by that particular BP firmware.

 

[Zeljko1234]

Interesting, thx. Could you please send me link to that pdf? Do you have maybe pdf for Razr HD too?
Usually vendors wish to spare some money and just use the same hardware with software locks. In this case, Motorola had to have two or more separate product lines for basically the same board with different PA.

 

[nagim]

Interesting, thx. Could you please send me link to that pdf? Do you have maybe pdf for Razr HD too?
Usually vendors wish to spare some money and just use the same hardware with software locks. In this case, Motorola had to have two or more separate product lines for basically the same board with different PA.

I found that googling for it (first hit), but the "problem" is with techinsights teardowns that they cost a lot of money (this was a free, public sample I think). I found no teardown for the XT926.
It's interesting to see the components of the Atrix HD, but there is a fundamental difference in my opinion, that is, the Atrix HD was created only for Verizon, so they didn't have to think about the other bands. I would like to see what amps they are using in the XT926. I haven't found any close-up naked pictures of the main PCB and the FCC internal photos are quite low res.
Maybe we need to swap also the antennas as well? As far as I know, they are band specific, too. Maybe swapping the frame (which contains the antennas) for one from an XT925 would do the trick?

 

[nagim]

...the Atrix HD was created only for Verizon..

I mean AT&T, sorry.

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[dtf1]

Is there any progress in the investigation ?
I mean is it possible or not to change the driver to use LTE in Europe on phones from for example Claro PR ?

Thx for reply.

 

[CWGSM3VO]

@kabaldan is correct.

Some of you may remember I was running the RTFR/CEE 4.4.2 soak-test on my Canadian XT925 for quite some time (simply because Rogers didn't have the 4.4.2 upgrade ready yet) and I lost my LTE. It's been explained in this thread and the CM11 thread (iirc) why I lost LTE.

Long story short -- I had French modem software flashed on my Canadian device and all I could attain was 3G, not LTE. Once Rogers released the official upgrade, I flashed the new modem software and LTE was available again.

You can flash different regions, but your still limited by the physical hardware configuration of the region it came from.

 

[fitsch11]

hi
any progress in this matter? meanwhile, is it possible to run XT926 with Eu LTE bands?

Thank you