LTE stopped working after update. - Galaxy S 4 Q&A, Help & Troubleshooting

I have a i337 S4 (att), and I use it in Brazil, under Claro service.
it's LTE frequency is 2.6ghz / band 7
According to samsung its compatible:
Frequencies and Data Type LTE: Bands 1/2/4/5/7/17; HSPA+/UMTS: 850/1900/2100MHz; GSM: 850/900/1800/1900MHz
However... My device came with MF3 (android 4.2), then I installed shostock 2.0 (android 4.2), and used it for over an year without problems, including LTE.
Problem began when i decided it's time for an upgrade..
I did a odin restore to MK2, then installed latest goldeneye rom over it, following all the instructions. LTE stopped working.
I got desperate, tryied restoring to MF3, found out its impossible.
Restored to stock MK2, no LTE..
Tried 8.1i shostock, no joy
Restore to stock MK2 again, then installed shostock 3.1, which is based on android 4.3, and i wouldnt have to run any workarounds to get to 4.4, i dont really care about having the latest android version.
Still no LTE. Right after that i tried flashing modems. tried MF3 and MJ9 modems... still the same..
What the hell is going wrong? I'm so used to LTE speeds that I find my phone useless without it.
any help would be apreciated, thanks.
best,
Felipe

howit said:
I have a i337 S4 (att), and I use it in Brazil, under Claro service.
it's LTE frequency is 2.6ghz / band 7
According to samsung its compatible:
Frequencies and Data Type LTE: Bands 1/2/4/5/7/17; HSPA+/UMTS: 850/1900/2100MHz; GSM: 850/900/1800/1900MHz
However... My device came with MF3 (android 4.2), then I installed shostock 2.0 (android 4.2), and used it for over an year without problems, including LTE.
Problem began when i decided it's time for an upgrade..
I did a odin restore to MK2, then installed latest goldeneye rom over it, following all the instructions. LTE stopped working.
I got desperate, tryied restoring to MF3, found out its impossible.
Restored to stock MK2, no LTE..
Tried 8.1i shostock, no joy
Restore to stock MK2 again, then installed shostock 3.1, which is based on android 4.3, and i wouldnt have to run any workarounds to get to 4.4, i dont really care about having the latest android version.
Still no LTE. Right after that i tried flashing modems. tried MF3 and MJ9 modems... still the same..
What the hell is going wrong? I'm so used to LTE speeds that I find my phone useless without it.
any help would be apreciated, thanks.
best,
Felipe
Click to expand...
Click to collapse
anyone?

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[Q] 4G LTE not working

HI Everyone I just recently root my phone and flasha custom ATT roms but for any reason my 4Glte is not working it says hspa on network type Does anyone knows how to fix this. I'm running on mk6 stock band and my machine is a canadian variant from Puerto Rico.Thanks for help me.
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cjoel37 said:
HI Everyone I just recently root my phone and flasha custom ATT roms but for any reason my 4Glte is not working it says hspa on network type Does anyone knows how to fix this. I'm running on mk6 stock band and my machine is a canadian variant from Puerto Rico.Thanks for help me.
Click to expand...
Click to collapse
you must install roms for sgh-i337m
Using Claro in Puerto Rico?
roms for gt-i9505 support if your team is sgh-i337m... my phone is sgh-i337m variant and this compatible install roms, which are SGH-M919 and SGH-9505
I f you want to saty on the rom you have now, check your APN settings, if you have the i337m and want a different rom, check out mapleleaf, it is close to stock and specifically for th i337m. You will need to flash modem NC1 through Odin PC.
4g lte not working
But one more thing my phone is unlocked and I'm ussing ATT service that why I am requesting help for the 4g lte issue.Should I use your recomendations or I have to wait new info.? otherwise I'm downloading mapleleaf .... mood (( STAND BY))))!

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No LTE after change rom

Hi,
I had bought a Canadian s4 on ebay with version 4.4.2, I had root it for unlock the Italian language, and worked fine for two years but without ever receiving the H + and H bands, he was always on LTE or 4G...
A month ago I decided to do an upgrade it and factory reset because te phone had become very slow, so after total wipe I downloaded the stock Lollipop I337MUMUGOH3 Trinidad & Tobago (because unlocked and more native language) and flash it with Odin, but after the softkeys have not worked ... I tried some other stock rom without succes, with I337MUMUFNE2_I337MUUBFNE2_TTT 4.4.2 the touch is coming back to work even if typing * # 2663 # the phone shows fw version is 0x10 and the part's fw version is 0x1a and can't get touch fw update (IC's F/W is higher than Bin's F/W), but I lost LTE bands, now working bands are always H and H+ and never LTE or 4G ....
I tried to install different modems taken from other stock rom, but without success ...and QPST show me all bands enabled...
Maybe i must change the baseband ??? Witch baseband? And how can i do it??
How can I get back the lte without losing softkey? And how can update the softkey fw?
I do not know what else to try :crying::crying::crying:
Thanks in advance..
I recommend not trying to flash the AT&T s4 sgh-i337 firmware to the Canadian s4 sgh-i337m. If you are able to flash the stock AT&T firmware onto the Canadian s4, you will have a locked bootloader.
Did you change your cell provider? Does the sim card get LTE in another phone?
You can flash the stock Canadian LP ROM from sammobile.com to see if the buttons work properly.
I recommend not upgrading the touch firmware at all as there is a chance it will disable all touch functions.
But my model phone is SGH-I337M!!
audit13 said:
I recommend not trying to flash the AT&T s4 sgh-i337 firmware to the Canadian s4 sgh-i337m. If you are able to flash the stock AT&T firmware onto the Canadian s4, you will have a locked bootloader.
Did you change your cell provider? Does the sim card get LTE in another phone?
You can flash the stock Canadian LP ROM from sammobile.com to see if the buttons work properly.
I recommend not upgrading the touch firmware at all as there is a chance it will disable all touch functions.
Click to expand...
Click to collapse
The sgh-i337m does not have a locked bootloader. The AT&T s4 has a locked bootloader so flashing at&t firmware to your Canadian s4 could result in a locked bootloader or a bricked phone.
There are no stock ROMs for the at&t s4 above 4.1.2 from sammobile.com like there is with the Canadian version.
It's up to you If you want to flash AT&T firmware to the Canadian s4.
audit13 said:
The sgh-i337m does not have a locked bootloader. The AT&T s4 has a locked bootloader so flashing at&t firmware to your Canadian s4 could result in a locked bootloader or a bricked phone.
There are no stock ROMs for the at&t s4 above 4.1.2 from sammobile.com like there is with the Canadian version.
It's up to you If you want to flash AT&T firmware to the Canadian s4.
Click to expand...
Click to collapse
I'm confused, I need some advice how to restore lte bands on my phone without broke the softkey, I did not say want to flash the ATT firmware....
Some ideas?
I apologize for referencing the AT&T firmware. I misread your original post.
Have you tried flashing firmware for a Canada. It doesn't matter whether your flash firmware for Rogers, Telus, or Bell as long as it is at least version OH3.
audit13 said:
I apologize for referencing the AT&T firmware. I misread your original post.Have you tried flashing firmware for a Canada. It doesn't matter whether your flash firmware for Rogers, Telus, or Bell as long as it is at least version OH3.
Click to expand...
Click to collapse
But the Canadian firmware not work properly in Italy, I used it for 2 years without H bands, the TTT firmware is for the same phone but is open, maybe I must change the csc?
I suggested flashing the Canadian firmware to see if the firmware fixes the problem with soft keys. Once that is fixed, you can try other fixes to get lte.
You can flash the stock Canadian lollipop ROM and change the csc by dialing *#272*imei#.

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