Help repairing IMEI on N900

[gasto40]

Hi

I tried to unlock Samsung N900 on 4.4.2 with Samsung Tool 17.2 (that was yesterday), and got IMEI 0049:

Selected model: SM-N900
Selected port: COM3 Z3X BOX Serial Port
Selected port speed: 115200
Please, allow USB debugging on phone...
Reading phone info...
Model: SM-N900
Android version: 4.4.2
Product code: SM-N9000ZKQTTT
Phone version: N900UBUENG1
PDA version: N900UBUENH1
CSC version: N900UUBENG1
IMEI: 359047050692241
Phone S/N: R21F35VV6CB
Checking Super user right... true
Reading nv data... OK
Checking magic... OK
Detected new type of security
Running zTool, please wait... OK
Calculating... OK
Unlocking... OK
Rebooting phone... OK
Unlock done
Done with Samsung Tool v.17.2

Selected model: SM-N900
Selected port: COM3 Z3X BOX Serial Port
Selected port speed: 115200
Please, allow USB debugging on phone...
Reading phone info...
Model: SM-N900
Android version: 4.4.2
Product code: SM-N9000ZKQTTT
Phone version: N900UBUENG1
PDA version: N900UBUENH1
CSC version: N900UUBENG1
IMEI: 004999010640000
Phone S/N: R21F35VV6CB
Done with Samsung Tool v.17.2

If I flash Z3X EFS Backup on Odin the phone gets IMEI back. But now if I flash to another 4.4.2 firmware phone gets IMEI and Baseband Unknown. My customer is really angry and want his phone just like before.

Could anyone explain step by step how to fix this with new 18.1 version?

[gasto40]

Anyone? Please.......

[gordgelin]

read about 18.1 samsung tool update, that will help

p.s. what i did - dowgrade to 4.3 - reset efs from i9500 tab - write cert - ok - upgrade to 4.4 - still ok )

[gasto40]

N900 cannot be downgraded from 4.4.2 to 4.3

[lonely_skyboy]

1. you root your phone.
2. wipe efs with samsung tools 18.1
3. write cert.

Try this it would help.