Xperia TA partition

anyone knows why am i having backup unsuccessful with my TA backup after using my phone for a few days before I decided to unlock my bootloader? It's because Sony did not respond quickly that's why my unlocking was delayed and now i'm facing problem because when i try restore dry-run, my backup is not working anymore. I'm pretty sure it was working before because did restore dry-run after the backup process.


[ ------------------------------------------------------------ ]
[ Backup TA v9.11 for Sony Xperia ]
[ ------------------------------------------------------------ ]
[ 1. Backup ]
[ 2. Restore ]
[ 3. Restore dry-run ]
[ 4. Convert TA.img ]
[ 5. Quit ]
[ ------------------------------------------------------------ ]
Please make your decision: [1,2,3,4,5]?1

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BACKUP
=======================================
When you continue Backup TA will perform a backup of the TA partition.
First it will look for the TA partition by its name. When it can not
be found this way it will ask you to perform an extensive search.
The extensive search will inspect many of the partitions on your device,
in the hope to find it and continue with the backup process.

Are you sure you want to continue? [Y,N]?Y

Waiting for USB Debugging...OK

=======================================
FIND TA PARTITION
=======================================
Partition found!

=======================================
BACKUP TA PARTITION
=======================================
dd: can't open '/sdcard/backupTA.img': No such file or directory

=======================================
INTEGRITY CHECK
=======================================
FAILED - Backup does not match TA Partition. Please try again.

*** Backup unsuccessful. ***

Press any key to continue . . .


im using:
Xperia M
Windows 10
Backup TA 9.11

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