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Go Back   GSM-Forum > Product Support Sections > Special Solutions / Services / WebShop > GPGIndustries Support section > Distributed Devices by GPG > GCPro Key

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Old 07-12-2019, 19:10   #1 (permalink)
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Join Date: Jul 2014
Location: Mexico
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Exclamation Samsung J727az Boot Loop GCPro


Hi there I was trying to Unlock this device J727az with GCPro I made this operation:

------------------------------------------------------------------------

Searching phone...
Device Found..
MODEL=SM-J727AZ;UN=C00003AA7D862B4;CAPA=32;VENDOR=TOSHIBA;F WVER=3;PRODUCT=500073;
Init ok..
Device := SM-J727AZ:USA:AIO:1:J727AZTUS3ARF1
Samsung Exynos EFS Reset Success..
Fail-Flash..
Possible New BootLoader Try Downgrade and retry...
Finish...

!!! Success !!!!
Restart Phone if not auto...
Total Time Take...00:03:23

------------------------------------------------------------------------------
I made a Backup of the imei's Certificade before this operation.
After this, the GCPro GUI was frozen, the device was at dowload mode stucked at half line of progress. I reset my device and its stucked at a boot loop at Cricket's logo. I re-flashed full firmware, and tried with Combination firmware too, but my device never finish booting up.

Any idea how can I fix this problem?
Ive never face this problem before

If I enter to recovery mode and try a "Factory data Reset" I get this error:

<
No Suport SINGLE-SKU
Suported API: 3
E:failed to mount /efs (invalid argument)
E:failed to mount /efs (invalid argument)
E:failed to mount /efs (invalid argument)
dm-verity error...
>
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Old 07-13-2019, 03:05   #2 (permalink)
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Join Date: Jan 2007
Posts: 158
Member: 439031
Status: Online
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Quote:
Originally Posted by bullracing View Post
Hi there I was trying to Unlock this device J727az with GCPro I made this operation:

------------------------------------------------------------------------

Searching phone...
Device Found..
MODEL=SM-J727AZ;UN=C00003AA7D862B4;CAPA=32;VENDOR=TOSHIBA;F WVER=3;PRODUCT=500073;
Init ok..
Device := SM-J727AZ:USA:AIO:1:J727AZTUS3ARF1
Samsung Exynos EFS Reset Success..
Fail-Flash..
Possible New BootLoader Try Downgrade and retry...
Finish...

!!! Success !!!!
Restart Phone if not auto...
Total Time Take...00:03:23

------------------------------------------------------------------------------
I made a Backup of the imei's Certificade before this operation.
After this, the GCPro GUI was frozen, the device was at dowload mode stucked at half line of progress. I reset my device and its stucked at a boot loop at Cricket's logo. I re-flashed full firmware, and tried with Combination firmware too, but my device never finish booting up.

Any idea how can I fix this problem?
Ive never face this problem before

If I enter to recovery mode and try a "Factory data Reset" I get this error:

<
No Suport SINGLE-SKU
Suported API: 3
E:failed to mount /efs (invalid argument)
E:failed to mount /efs (invalid argument)
E:failed to mount /efs (invalid argument)
dm-verity error...
>
hello I need efs backup j727a az
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The Following User Says Thank You to ector For This Useful Post:
Old 07-13-2019, 18:35   #3 (permalink)
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Join Date: Jul 2014
Location: Mexico
Posts: 5
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thanks... moving to that thread
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