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Feb 3, 2016
I lost my EFS partition when recovered my phone via EDL, crying now :(
Well, I flashed Engineering Rom from here
And I changed IMEI1 IMEI2 MAC and BT addresses through some tools (Qualcomm IMEI Repair Tool / QMSL IMEI&SN Writer v1.4)
Rebooted system after changes made...
F*** It's ok! I see "20:00:00:00:00" at mac address info while wifi is off, IMEI SV info is "00" and changing serial doesn't worked.
The changed wifi address value only works while Engineering Rom is running, otherwhise the value changes back to 00:0a:f5:e8:b9:f8 ohhhhh f***, this happens when I update to stock rom.

I have QFIL and QPST installed on my machine, I enter diagnostic mode and I can see the contents of the EFS partition, my doubts are: is there a way to permanently change the data in "IMEI1 IMEI2 IMEI SV SN BT WIFI etc." so that new roms read the "default"?
What are the value chains I should change? .xqcn file editing made global changes?

Please help me :(