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[REQUEST] Anyone willing to extract and share qcn / xqcn backup ?

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Superboy58

Senior Member
Jun 3, 2010
140
65
Clermont-Ferrand
Hi,

I recently tried to flash qcn on my OnePlus 7T and it seems that I lost efs data (some sensors aren't working now).
To extract qcn or xqcn file you need to enable usb diagnostic port (in phone app dial *#801# and click the second and fourth buttons).
Doing so will make your phone detectable in Qualcomm softwares.
To extract qcn, use QFIL and click Tools>QCN Backup/Restore. In the field "QCN file path" write the path to the directory you want to save the backup, and also write the name of the file that will be created. Then click Backup QCN.

To extract xqcn, use QPST Software Download, and go to the Backup tab. Click Browse to select the destination for the xqcn backup, and set a name to the backup that will be created. Then click start.

Doing this process is quick and should take approximately 5 minutes if you already have the QPST software.
In case you need it, I have the installer from Qualcomm for QPST 2.7.480 :
http://www.mediafire.com/file/nm0zlac003tn41j/qualcomm_qpst_setup_2.7.480.zip/file

Also you have to know that your IMEI will be visible in these backups, and you should remove them using an hex editor to replace it with some random numbers or zeros before sharing it with me or anyone.
If you need informations on how to find your IMEI in your qcn or xqcn backup using an hex editor, I will explain it in this thread too.

Thank you :)
 

Superboy58

Senior Member
Jun 3, 2010
140
65
Clermont-Ferrand
Thanks @egekonuk for your reply.

In fact I was trying to flash international rom version on my TMobile Oneplus 7T by editing MSM download tool (using x64dbg which is a software sharing many functionalities with IDA Pro).
I did not managed to flash international but yes, I lost efs in the process.
 

amcferrin90

Senior Member
Oct 2, 2013
95
28
CMH
Thanks @egekonuk for your reply.

In fact I was trying to flash international rom version on my TMobile Oneplus 7T by editing MSM download tool (using x64dbg which is a software sharing many functionalities with IDA Pro).
I did not managed to flash international but yes, I lost efs in the process.

Just curious why you didn't do the other posted method to go from TMO to international? I did the other method and it worked out just fine. Of course I don't know if that very friendly person is still doing unlocks or not.

Is there a difference between the QCN and XQCN between ROMs?
 

Superboy58

Senior Member
Jun 3, 2010
140
65
Clermont-Ferrand
@amcferrin90 yes I didn't mentioned that but it's because my device was not SIM unlocked by T-Mobile. I bought it on ebay and I was not aware it was not paid off, and seller refused a return.
If I was SIM unlocked, I'd be able to unlock the bootloader and flash the international rom using fastboot.

I did not understand what you meant about qcn, xqcn and roms.
To me, qcn and xqcn are different because xqcn backups are larger than qcn ones.
I think xqcn contains some efs data, but I'm not sure about this.

Would you be ok to make a xqcn backup and share it with me?
Thanks