Complete guide to repair IMEI on M919 running 4.4.2
 

As all you noticed new 6.7.1 nspro causes to may troubles to users. For me it "bricked" few phones on unlocking and imei repair. EFS backup made with nspro cannot be written back in order to fix EFS and IMEI. So it`s totally useless. However, always do EFS backup.
Hope Elco will take care of that.

In order to change/fix/repair IMEI on GS4 m919 on 4.4.2 UVUFNB4 modem/baseband has to be downgraded. Root required.

1. Root with ch-auto-root
CF-Root Download

2. Use attached Odin flashable UVUMDL modem
Modem_UVUAMDL.tar

3. using nspro fix/change IMEI

4. restore modem with attached uvufnb4 modem pulled out from stock 4.4.2
M919UVUFNB4.BLs.NON-HLOS.MODEM.tar

this modem tested many times. with other modems from other source you may experience issues with sound and wifi.

do you know if will work on the i337 from att?

Thsnk you for the how to mate.

Will the ch-auto-root CF Root work with all 4.4.2 android versions and also 4.3 or is it just for the M919 ?

Thank you

Lollypop

this is complete list of all cf root files.
CF-Auto-Root
all works on 4.3. some of them work on 4.4.2
---
haven`t tried on i337 4.4.2. I believe, there is no root method for i337 4.4.2 so far.

For Model Samsung i337 4.4.2
Downgrade modem to MK2 using Odin...
Root phone with Saferoot...
Repair/Unlock etc...
Flash back NB1 Modem using Odin...
DONE.....

I made a imei change on one m919 4.4.2 today (UVUFMB4) after nspro finish the process the imei was null. I flash with odin the full firmware UVUFNB4 and everyting was ok the new imei and all is working good.

Sent from my LG-D800 using Tapatalk

I tried this process with the modem downgrade but the phone freezes and the imei repair fails when running on 4.4.2. Please let me know if any of you guys experience this issue too. I've test the modem downgrade extensively on other lower revisions and they all work fine but for some strange reason it only happens with this version. I'm still running the older version of NSPRO so do you guys think that this might be the issue because I'm still on 6.6.8 b/c allot of other members said that after this revision the software is giving them allot of difficulty when performing certain service functions.

Old version is ok. I am also using old one. works better, more stable, kills less phones ))

Phone can freeze, when you flashing wrong modem.
have you used modem posted on first topic?

this solution works perfect :) excellent job.

do it with the nspro 6.7.1 you will be ok.

it ****s WIFI
 

it ****s WIFI

DON'T DO IT!

what i cant understand why mr elco not releasing software fix 6.7.1 is fuking up pple phone and nothing being done about it

this method recovers wifi and makes phone fully functional. tested many times by many members.

im agree the solution works perfect , i think those guys only downgrade the baseband but never put in back the NB4 baseband when they done with nspro, you guys have to follow the steps already did 4 of them. (m919)

i did that and changed pda to modem it fails