Cyan and LTE

[TheSuperShoe]

nothing seems to have changed here - same boat.

I third this.

 

[Derausgewanderte]

nothing seems to have changed here - same boat.

is it fair to say that LTE will work as long as you flash and stick with a RM-820 rom (e.g. Rogers), but if you at any point flash with a RM-821 rom (e.g. FR) you will have issues with LTE?
If nothing happens this week, I may spend the weekend flashing the Rogers pre-portico and then the Rogers Cyan (faster than OTA) and see how that goes (worked once before with Amber on another L920 I had).

 

[johaas]

is it fair to say that LTE will work as long as you flash and stick with a RM-820 rom (e.g. Rogers), but if you at any point flash with a RM-821 rom (e.g. FR) you will have issues with LTE?
If nothing happens this week, I may spend the weekend flashing the Rogers pre-portico and then the Rogers Cyan (faster than OTA) and see how that goes (worked once before with Amber on another L920 I had).

If you manage to get pre-portico flashed back on your phone, please let me know how you did it. I've been through about 12 roms over the last week and apart from the ATT roms that refuse to flash, the pre-portico Rogers rom continues to throw FFU errors. I found a Russian RM-821 of firmware 1232.2109.1242.1002 which, interestingly, brought back LTE Band 4 in my field test mode. Maybe I'll reflash that and try the dummy profile trick.

 

[exiva]

nothing seems to have changed here - same boat.

I third this.

The OP said they are on at&t, so maybe an at&t SIM is needed to kick it in with the at&t profile? I don't have an at&t sim card to test.

 

[mdecker79]

This is an AT&T phone and I think it was a fluke. Just so you guys don't think I'm nuts this is what I saw right after I made the change and tested.

 

[exiva]

*sigh* So who wants to start the collection pool for an ATF box & Dolphin clip kit to jtag back to at&t fw?

 

[thejaredhuang]

The foreign SIM trick worked for me on my Rogers 920 on T-Mobile US running Cyan + 8.1.1. Internet Sharing is enabled and works fine on LTE and HSPA+

What SIM did you use? I'm thinking about the Vodafone UK:
http://www.amazon.com/gp/product/B0...ag=hawk-future-20&ascsubtag=UUwpUvbUpU2747174

I haven't read the rest of the thread (so don't hate me if I'm re-posting anything).

Thanks but no thanks, next time it might be better to read the thread.

Bingo!!! This worked for me. I now have LTE on AT&T.

Doing a network speed test I went from 2.31 Mbps to 10 Mbps after the change.

Thank You!

I'm so glad I jumped from AT&T. I have 65mbps in my area on T-Mobile. Glad you got LTE back though.

 

[pankaj981]

What SIM did you use? I'm thinking about the Vodafone UK

I used an Airtel India SIM

 

[Derausgewanderte]

is it fair to say that LTE will work as long as you flash and stick with a RM-820 rom (e.g. Rogers), but if you at any point flash with a RM-821 rom (e.g. FR) you will have issues with LTE?
If nothing happens this week, I may spend the weekend flashing the Rogers pre-portico and then the Rogers Cyan (faster than OTA) and see how that goes (worked once before with Amber on another L920 I had).

well, what do you know. patience paid off for once....

 

[meowmixmeow]

Bah, my Lumia 920 is on the French rom and I use ATT for my provider. After Cyan, my phone only detects 2g, and 3g networks, LTE and 4g are no where to be found. I'm now capped at H+ with download speeds of 1.03 mb/s. Its so slow now ;(. I miss LTE

 

[calvano915]

I gave in and flashed Rogers rom to my Red ATT 920. LTE etc preserved, Internet sharing works (did foreign sim jic), and MMS/data is fine with settings. Had issues trying to use Developers Preview to go latest, so I'm just running OTA cyan.

 

[exiva]

Got Nokia software Recovery to flash my at&t Lumia 920 w/ FR rom to reflash the FR rom. The product code doesn't match, that's why the tool won't normally work. Used a proxy to modify the requests, so... Will see if that works like Rogers. Will edit post later.


IT WORKS! 4G!!!

Edit 2: Okay, that was weird. It totally had 4G, and then it popped up a dialog "Your phone will reboot in 10 seconds" and after the reboot it lost 4g. No 4g after a reset... Still diagnosing. I think it may be the Access Point app. Seems I'm close though.

Edit 3: Just for proof, here's a screengrab from a video I took, it wasn't worth posting the video because it did the same thing again. But, as you can see it does show 4G on the french rom.
​
Edit 4: Throwing in the towel for the night. I feel like I'm close, since 4G is back on setup, but disappears sometime between setting up apps and reboot required. Tomorrow I'm going to try a non-CV RM-821 rom (Like a O2 or something) and if that fails, getting back to at least a RM-820 Rogers.

 

[worawson]

What proxy did you use and what settings? Thanks for all your effort and for sharing.
What I have found is the LTE Bands keep switching to Global from AT&T US when I get to Lumia Black update or sometimes if I do Hard Reset. This seems to be rom independent. Of course I can only check what the Field Test Mode shows with roms that allow ##3282#. This has been with OTA or with Direct Flash of firmware. I don't have LTE service at my home and need to travel about 15 miles to test which has made it a little slow process.
Thanks
Will I Am

 

[exiva]

What proxy did you use and what settings? Thanks for all your effort and for sharing.
What I have found is the LTE Bands keep switching to Global from AT&T US when I get to Lumia Black update or sometimes if I do Hard Reset. This seems to be rom independent. Of course I can only check what the Field Test Mode shows with roms that allow ##3282#. This has been with OTA or with Direct Flash of firmware. I don't have LTE service at my home and need to travel about 15 miles to test which has made it a little slow process.
Thanks
Will I Am

I used mitmproxy, and my own filters looking for 'caresuite' changing the product code 059N5T5 to 059R017 (FR rom) You should somehow be able to port this over to fiddler. Basically, if you look at the Recovery tool, it shows the product code as the old at&t code 059N5T5 but product code RM-821. Recovery tool sends a request out (Even if you have the firmware downloaded mind you.) and asks what's the right firmware for a 059N5T5 RM-821? Server sends back 'wtf? that doesn't exist' and recovery bails. Today I'm going to try and get Rogers FW back on, and see if that can work. I think I can gather from posts above that if you get at&t developer on you can get to Rogers pre-portico that way? Not sure. Maybe editing VPL files might work? Donno, that's all on my list of things to goof with today. But, it seems that like other devices LTE doesn't get bricked, and can come back. So that's good.

I don't think the field test app works, to be honest. Even WCDMA shows up as invalid, so I think it's broken and that's why access was removed in most firmwares.

If you (or anyone else) want to collaborate and share notes or something on Skype or some other IM service, send me a message. I think this is highly possible to get done.

 

[exiva]

Okay, here's where I am. Nokia Software Recovery Tool I got to install the at&t developer rom. Right now, after installing and rebooting and all that, my network indicator is sitting at "L". My speedtest shows 5mbps down, and about 3 up. But, I do have a ****ty signal at the moment. Insider shows Cellular_LTE... So...

Edit: I will package up my data folder, and write a short guide on what I did that someone can figure out how to port to fiddler, or I can open my proxy on a case by case basis if we communicate in advance over Skype or some IM solution for those who cant be bothered or know how.

 

[johaas]

You do the Lord's work, my friend.

 

[exiva]

Here's the packages folder I used, this has the at&t developer 3051.50009.1424.0001 (Cyan & 8.1) rom. I think I may have tweaked the VPL file, but I can't recall. Anyway, put the Packages folder from the zip in C:\ProgramData\Nokia. (Yes, I know it's all in the RM-821 folder, leave it that way. Just put the zip in as is.) If you currently have a Rogers or some other rom on your phone now, rename the folder to RM-820, if you have a EU rom on your phone now leave it as RM-821.

Now you'll need to modify the requests Nokia Software Recovery Tool makes. I used mitmproxy, because I am a unix guy and was doing this on my Mac with Parallels. If someone can figure out how to port it to fiddler though, it will work the same.

Install the SSL root certificates (Read the manual of the proxy you are using for more information here.) it will NOT work without installing these certificates.

Create an intercept filter, replacing "RM-821" with "RM-820" on requests matching "caresuite". Now you'll need a second filter, matching your current device's product code with "059R2L5" for me with a Yellow Lumia 920, it was "059N5T5" (It should be on the left side of the Nokia Recovery Tool window.)

Here's the fiddler script for replacing from worawson. Again, replace 059N5T3 with YOUR device code, it's on the left side of the NSRT window.

Launch the Nokia Recovery tool, and hit the Options button, configure it to use the proxy you setup and plug in the phone. It should say after a few minutes it can flash 3051.50009.1424.0001 start the flash, and LTE will restore.


I've upgraded to 8.1 Update 1, and LTE remains. Tethering will pop up the "your current plan doesn't include tethering" error. Perhaps one of those other tricks will work, maybe they won't... I haven't tried it. LTE is more important than tethering to me to be honest.


You may be able to re-flash on a Rogers rom, but again, I didn't try it. I did however try to flash a regular at&t rom and it wouldn't take. I didn't try really hard because everything seemed to be working fine and this was good enough for me plus I had already setup everything.


if you can't run a proxy, or don't know how. Drop me a PM, and I'll send you my Skype username. I'll open up my proxy for you to use to flash your device. Any questions just leave them here. I think I covered everything.

 

[pattymcfly]

Hey - huge thank you for figuring this out!

Dropping you a PM right now.

 

[Derausgewanderte]

Here's the packages folder I used

great detective work! maybe a good idea to post this in this thread as well. Lots of people ended up scratching their heads.
http://forums.windowscentral.com/nokia-lumia-920/236790-47.htm

 

[pattymcfly]

Confirmed working - just got my rogers pre portico to euro dev amber rom flashed back to an ATT rom and have LTE. Have not yet tested tethering.