How To Fix Try downgrade modem if possible - Unlock error On Galaxy J5 Prime (SM-G570F)

When you try to unlock the network on Samsung Galaxy J5 Prime (SM-G570F) using Z3X Samsung Tool PRO, you may get an error like this...

Reading data from phone... error (0)
Try downgrade modem if possible

To solve it, you must do a full flash with the firmware below to change the network code.

SM-G570F G570FXXU1APLC

 

After you flash, root your Samsung Galaxy J5 Prime (SM-G570F) and continue unlock using Z3X Samsung Tool PRO.  

How to root Samsung Galaxy J5 Prime (SM-G570F)?

Before flashing

Waiting ADB device... OK
Reading phone info...
Model: SM-G570F
Android version: 6.0.1
Product code: SM-G570FZDDKSA
Phone version: G570FXXU1AQC1
PDA version: G570FXXU1AQC2
CSC version: G570FOJV1AQC2
CSC country code: KSA
CSC sales code: KSA
HW version: MP 0.500
Phone SN: R58J54JECGD
Chip name: EXYNOS7570
Modem board: SHANNON305
Security patch: 2017-03-01
RF cal date: 20170520
IMEI:
Checking Super user right... true
Reading NV data... OK
Checking NV data... OK
Reading data... error
Security damaged (4 23)
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Reading data from phone... error (0)
Try downgrade modem if possible

After flashing and unlock done

Waiting ADB device... OK
Reading phone info...
Model: SM-G570F
Android version: 6.0.1
Product code: SM-G570FZDDKSA
Phone version: G570FXXU1API9
PDA version: G570FXXU1APLC
CSC version: G570FOJV1APIB
CSC country code: KSA
CSC sales code: KSA
HW version: MP 0.500
Phone SN: R58J54JECGD
Chip name: EXYNOS7570
Modem board: SHANNON305
Security patch: 2016-09-01
RF cal date: 20170520
IMEI:
Checking Super user right... true
Reading NV data... OK
Checking NV data... OK
Reading data... error
Security damaged (4 23)
Initialization zTool... OK
Running zTool, please wait...
Start... OK
Initialization... OK
Generate and check client proof... OK
Verify proof by client... OK
Reading data from phone... OK
Modem board: SHANNON305
HWID:  E3 6F 98 58 9B 03 CA E8 32 6B FB 73 0A 00 00 00
Calculating... OK
Unlocking... OK
Writing NV data... OK
Rebooting phone... OK
Unlock done
Done with Samsung Tool PRO v.28.6

Any damage that happened to your Samsung Galaxy J5 Prime (SM-G570F) is your own responsibility.