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LTE not working on marshmallow?

Hi guys,
I am having trouble with LTE signal on android 6.0.1. I bought the phone in Malaysia when my old phone died on holiday. Now this s6edge was running on a modified android 5.1.1 which claimed to be a 925f model but it was a modified android somehow. Root check showed root access but no modified bootloader or supersu apps. 4g did work but a lot of other things did not work properly (because csc was CHN).
I found out I had a 925p model after failing trying to manually flash the phone to a Dutch marshmallow stockrom for the 925f (which tripped the KNOX counter grrr). The original bootloader showed the phone was 925p, so I flashed with the newest pb6 6.0.1 rom.
All seemed working fine but I cannot receive LTE signal anymore. Atm living in the UK with UK sim and I can only receive a slow H+ signal. Will i need to flash the modem.bin from 5.1.1 to get it working again?
I am getting kind of desperate now. I am not rooted and only wish to get a decent working phone and signal!

Nexus 5 modem

Hello. Faced such a problem, the network was gone. The first time I decided very simply, I installed a modem KRT01B (4.4) via fastboot,
M8974A-1.0.25.0.15, the firmware was at that time Fake Nexus (sashok). I decided to flash another custom firmware, and lost EFS (IMEI), restoring it on an instruction with xda, and returned to stock 6.0.1. Network was not, after the firmware KRT01B (4.4)
M8974A-1.0.25.0.15, again disappeared have, and in the settings of baseband unknow, IMEI is also unknow. How to flash the modem so that the IMEI does not disappear?
P.S: Sorry for my English, I'm from Russia, and I was helped by Google Translate

Installed the firmware via LG Flashtool, the result is the same

Terrible signal

I'm running 7.1.1 on my z5 which is on ee in UK, when I use my sim in my 2013 nexus 7 tablet I get a good signal at home but when I return it to my z5 I have to walk 200mtrs to pick up a signal.
Is there anything I can do, custom rom ?

the local modem file is probably not optimized.
depending on the last official firmware you flashed using flashtool, if the modem drivers where from a country not suited to yours then it could be giving you poor signal.
make a backup of your phone.
flash a CDA with modem from a official rom (of the same version as your custom rom) for the country you live in. (keep track of your original CDA for warranty)
after flash reflash your custom recovery, and restore your backup. this should then give you the best signal for your country.
My phone was bought in the US (international version) i use it in Canada. original CDA was Sweden. but I installed a Canadian CDA to improve signal.

Cheers mate but my phone is just stock I'm not running a custom rom on it, I'm seriously thinking about it tho. It was updated via software update on the phone itself...

N915FY try to Root with CW - after that only 2g (E) no LTE

Hello
I tryed to Root my FY and make 2 Mistakes. First: Wrong File, Sekond: I dont have wrote the old Firmware.
After CW the Phone has Bootloop - I fixed it with Flashing TWRP and a Custom ROM. After that i realized a poor Signalstreangth.
Then i started to flash oner Rom after the other. Everytime with a Wipe in Front. Until now i haved flashed 5 Custom Roms, Stockroms 4.4.4, 5.0.1, 5.1.1, 6.0.1
The MM Roms i used 4 File and Singlefiles.
Have anyone of you a sugestion for me?
Greetings FT

I am having the same problem in my N915FY but in my case I only get (e) instead of (H+). I have a 4g sim card. When I use the same sim card on other phones (samsung note 3) I get (H+) and internet speed is superb. I tried using other sim cards in my n915FY and only extremely slow (e) internet is available. I have tried changing the LTE band (*#0011#) and flashing different stock firmwares with no improvement. I took my phone to my Connection Provider which is 'Grameen Phone' in Bangladesh, they tried with some settings and advised me to replace the sim card and I did. But this did not solve the problem. I bought the phone from UK and now I am using it in Bangladesh.
Pls help??? TIA

Question about VoLTE in another firmware that's different from my country

Hi , my XZP came with an unlocked bootloader, and the firmware is the one for my country, but is a lot bloated, and also I don't like the boot animation, and shut down one .
My question here is this , my firmware supports VoLTE , if I flash another firmware will i lose that option?? If yes, then what archive do I need to avoid in order to flash my device without losing the VoLTE option.
Thanks .

Anybody??
Also if I have my bootloader unlocked, how do i root the phone on Android pie ?? My firmware is
47.2.A.10.107

Well i flashed a german customized firmware,and excluded modem.sin from the flash, everything went smooth and i have the VoLTE settings.
I think that i need to call to my operator in order to have VoLTE calls because when i make one, it shows me HSDPA.
Also when i excluded the modem from the flashing, i was expecting yo have the same modem, but no, just look at the screenshots.
And finally can please anyone point me in the right direction in how to flash this device with this firmware : G8141_Customized DE_1308-5289_47.2.A.10.107_R6C
Thanks.