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G920F Weirdness Firmware

Hello,
Just bought a topaz blue unlocked S6. I think it came from an Asian country. The phone arrived perfectly with plastic in box with the same IMEI as phone. However it was rooted with SU. I went into the app and clicked to remove root. It was on 5.0.2. They I tried to flash original firmware with Smart Switch with no success.
I used odin to flash stock 5.1.1 firmware from the UK. The firmware was for 920F. It went all good. I have LTE, SMS and phonecalls. However, sometimes the baseband appears as unknown, but I still can make calls and have LTE. And it still shows the same IMEI as it is on the box and it has always shown it. Is there a way to fix this? Now, I try to flash stock firmware with Smart Switch and it says it can't initialize.
I would REALLY appreciate help. I would love to be able to flash stock firmware from Smart Switch.
I'm in México with Telcel, which uses the same bands as AT&T.
P.S. I really searched and couldn't find anything on my specific situation.

That happened to me when I was still on 5.0.2 and flashed only the 5.1.1 modem. I would suggest downloading the modem.tar file and flash that. Should all be good after that.

I'm currently downloading G920FXXU1AOD4 BTU firmware to flash it with Odin. Might that help me better? My main goal is to be 100% stock without any weirdness. And having Smart Switch recognize my phone!

Well, I'm sad.

calot said:
I'm currently downloading G920FXXU1AOD4 BTU firmware to flash it with Odin. Might that help me better? My main goal is to be 100% stock without any weirdness. And having Smart Switch recognize my phone!
Click to expand...
Click to collapse
You cannot downgrade to 5.0.2 from 5.1.1. Your bootloader will not support. I have the issue with 3G connection. Where to get the Modem.tar?

Rom with Functioning Fingerprint scanner and data - International

Hi guys, I have a G900p on 4.4.2 rooted with Phils recovery. My goal with this phone was to be able and use data internationally once it was unlocked, data didnt work on stock software. So I flashed Shohat Rom v5 and that made my data work, but my fingerprint scanner was unusable. What rom can I flash into this phone to have functioning data and functioning fingerscanner. Please consider that I am in Mexico which is international and I need data.
Thank you

the newest stock rom now has international data working
G900PVPU3BOK4 12/02/2015
Sprint Global Roaming
Security Updates
Minor UI Updates

I have an s5 on 5.0
Robalboa said:
the newest stock rom now has international data working
G900PVPU3BOK4 12/02/2015
Sprint Global Roaming
Security Updates
Minor UI Updates
Click to expand...
Click to collapse
Hi, I also have a G900p sprint S5 on 5.0 software - G900PVPU3B0G1, but it also picks up no data at all here internationally. It picks up signal calls and all, but no data and I cant find the way to downgrade it to 4.4.2 since every time I try with Odin it simply fails. I wouldnt want to upgrade it to that new version, since then I think it would be even harder to downgrade to 4.4.2? hope you can lend a hand and let me know.
Thanks

CellTech03 said:
Hi, I also have a G900p sprint S5 on 5.0 software - G900PVPU3B0G1, but it also picks up no data at all here internationally. It picks up signal calls and all, but no data and I cant find the way to downgrade it to 4.4.2 since every time I try with Odin it simply fails. I wouldnt want to upgrade it to that new version, since then I think it would be even harder to downgrade to 4.4.2? hope you can lend a hand and let me know.
Thanks
Click to expand...
Click to collapse
well you cant downgrade the bootloader to anything below OG1 if your on stock. but if you root it you can install any custom rom through the custom recovery you added when rooting.
including flashing a 4.4.2 rom as long as your rooted with custom recovery.
when you flash a rom in the custom recovery your only flashing the rom itself not the bootloader. so you can go back to whatever rom you want but it must be done through a custom recovery. so to break it down
even if you upgrade and it doesnt give you the data your looking for you can root and flash an old rom.
one old trick that used to reset the data was a dialer code ##SCRTN# (press those digits in the dialer pad) it resets the entire data profile for the phone . so good luck the rest should be in the forums

If I'm on OG1 and rooted I can flash back to 4.4.2 ? Do I need to flash modem and kernel from the older version I'm flashing ?

Update the Modem/baseband Firmware*

I successfully installed a CM13 ROM for a different variant than my phone. Installed ROM jfltexx variant intended for a Gt19505 model S4 on an i337z S4. It worked and now the device model in phones settings shows listed as GT19505.
ROM works fine, phone dialer functions but I read that I should update the radio firmware. I have had a call or two drop off with no ringing sound but call is apparently going through but I can not hear person on receiving end.
So what baseband modem firmware do I update to? The true hardware i337z or the GT19505 that the phone is working as? I went from Kit Kat 4.4.2 to Marshmallow 6.0..
Baseband Version after installing CM13 jfltexx remains the original i337ztuuboa3. Everything else has changed to reflect CM13 ROM. Build, Kernal etc.
I'm baffled so any help would be greatly appreciated.

I'm suffering the very some issue and few others.
Just noticed that my present baseband is I9505XXUGNF1.
I've downloaded the I9505XXUHOJ2_I9505ITVHOJ1_ITV nd extracted both modem.bin and NON-HLOS.bin and flashed using Heimdall on OSX via cli.
But the phone is still reporting the old BB number.

You need to flash i337z model's RIL files & Modem. Don't know where you will get that but that's what you need to flash for sure..
rivnyak said:
I successfully installed a CM13 ROM for a different variant than my phone. Installed ROM jfltexx variant intended for a Gt19505 model S4 on an i337z S4. It worked and now the device model in phones settings shows listed as GT19505.
ROM works fine, phone dialer functions but I read that I should update the radio firmware. I have had a call or two drop off with no ringing sound but call is apparently going through but I can not hear person on receiving end.
So what baseband modem firmware do I update to? The true hardware i337z or the GT19505 that the phone is working as? I went from Kit Kat 4.4.2 to Marshmallow 6.0..
Baseband Version after installing CM13 jfltexx remains the original i337ztuuboa3. Everything else has changed to reflect CM13 ROM. Build, Kernal etc.
I'm baffled so any help would be greatly appreciated.
Click to expand...
Click to collapse

Thanks. I'll search around. Problem with calls is few

Few. I say 5 % of time usually when I'm going from one area to another so I'm not certain I want to mess up phone. Couple of questions, I am using latest modem for phone as far as I know, bought it in Oct 15,and Cricket has no new update beyond 4.4.4. Are you positive it will not mesd

To flash should I use existing TWRP recovery, Odin. for those file types? I'm guessing Odin.
Once again thanks for your help

Samsung S5 Help

I decided to experiment a bit and used this rom "http://forum.xda-developers.com/galaxy-s5/unified-development/rom-cyanogenmod-13-0-android-6-0-t3237502" which is CM13 with the experimental 6.0.1 on my S5. Everything worked flawlessly except I cannot use my signal at all. I decided to mess with my APN settings but couldn't get it to connect to no avail. I want to downgrade back to my phones stock firmware (5.0). Can anyone help?
Also my phone model is a SM-900P. Its the boost variant but they're interchangeable between the Sprint/Boost variants.
If possible, I would like to just downgrade back to 5.0, but if anyone could help with restoring my signal on 6.0.1 It'll be greatly appreciated!

Check your APNs

N920P issue to work in UK, upgraded to MM from china firmware N920F help!

Ok im really hoping someone can help me.
Bought a N920F (yup doesnt exist but N920p's have taken a trip to China to be turned into this strange model)
Now the phone was working fine on Lollipop, and model used to show N920V and baseband Sprint it was like a hybrid custom firmware probably hacked up to be used in UK, but download mode etc. showed it was a N920P originally. Now I wanted to upgrade to Marshmellow, before this I made a nandroid backup and also backed up Radio & Efs using app.
Upgraded succesfully with stock N920P and now no network, tried everything. Then thought I could downgrade via flash to Lollipop to no avail as I think its now locked to do so. Nandroid restore not happening as I believe its locked to restore also unless maybe I was on lollipop.
So now im stuck on stock N920p firmware thats not working in UK networks. Im about to give up, is there any solution. Would unlocking the phone in its current state unlock it to UK networks. I hope there is a solution.
Any help to the right direction is much appreciated.
Things ive tried
Downgrade-unsuccessful
Restore Partitions-unsuccessful
Flash N920V-unsuccessful
Full restores etc-unsuccessful
nandroid restore-unsuccesful
Kind Regards

oneshot12 said:
Ok im really hoping someone can help me.
Bought a N920F (yup doesnt exist but N920p's have taken a trip to China to be turned into this strange model)
Now the phone was working fine on Lollipop, and model used to show N920V and baseband Sprint it was like a hybrid custom firmware probably hacked up to be used in UK, but download mode etc. showed it was a N920P originally. Now I wanted to upgrade to Marshmellow, before this I made a nandroid backup and also backed up Radio & Efs using app.
Upgraded succesfully with stock N920P and now no network, tried everything. Then thought I could downgrade via flash to Lollipop to no avail as I think its now locked to do so. Nandroid restore not happening as I believe its locked to restore also unless maybe I was on lollipop.
So now im stuck on stock N920p firmware thats not working in UK networks. Im about to give up, is there any solution. Would unlocking the phone in its current state unlock it to UK networks. I hope there is a solution.
Any help to the right direction is much appreciated.
Things ive tried
Downgrade-unsuccessful
Restore Partitions-unsuccessful
Flash N920V-unsuccessful
Full restores etc-unsuccessful
nandroid restore-unsuccesful
Kind Regards
Click to expand...
Click to collapse
Check if there is a service menu in your settings
It should be named "activate this device"

oneshot12 said:
Ok im really hoping someone can help me.
Bought a N920F (yup doesnt exist but N920p's have taken a trip to China to be turned into this strange model)
Now the phone was working fine on Lollipop, and model used to show N920V and baseband Sprint it was like a hybrid custom firmware probably hacked up to be used in UK, but download mode etc. showed it was a N920P originally. Now I wanted to upgrade to Marshmellow, before this I made a nandroid backup and also backed up Radio & Efs using app.
Upgraded succesfully with stock N920P and now no network, tried everything. Then thought I could downgrade via flash to Lollipop to no avail as I think its now locked to do so. Nandroid restore not happening as I believe its locked to restore also unless maybe I was on lollipop.
So now im stuck on stock N920p firmware thats not working in UK networks. Im about to give up, is there any solution. Would unlocking the phone in its current state unlock it to UK networks. I hope there is a solution.
Any help to the right direction is much appreciated.
Things ive tried
Downgrade-unsuccessful
Restore Partitions-unsuccessful
Flash N920V-unsuccessful
Full restores etc-unsuccessful
nandroid restore-unsuccesful
Kind Regards
Click to expand...
Click to collapse
now the 920p firmware is locked out of the box if it was unlocked sometimes certain rom flashes will relock
as prev poster said activate device is for sprint users only will never work
have you tried to goto network settings and making sure its set for global or automatic.
also is it saying invalid sim or anything like that normally first signs of being relocked.
i paid 34.99 for a unlock from the idone app worked great.