FAQ from MOBILE-FILES.COM

[GSM™]

1.
Choose correct model ( DB200x/DB201x/DB2020/PNX5230 CID49/CID50/CID51/CID52/CID53 supported )

2. Choose "SETTINGS" tab.
Check

"PATCH OTP<>GDFS CHECK IN FIRMWARE"
"ALLOW TO CHANGE IMEI WHEN UNLOCKING"
for DB2012/DB2020 only
"USE SERVER FOR UNLOCK/FLASH"
"USE ALTERNATIVE SECURITY BYPASS"


3. go back to SEMC tab, press UNLOCK

4. when prompted, enter required IMEI

NOTE:
REAL IMEI NOT changed, flashpatch "forges" IMEI via some trick.
no worry though, network (and customer) will see NEW IMEI.
but, once phone will be updated on SEUS it will return to original IMEI.
same applies to flashing main part of firmware.

BE AWARE THAT CHANGING IMEI IS ILLEGAL AND PROHIBITED BY LAW.
USE IT FOR EDUCATIONAL PURPOSE OR IF YOU HAD CHANGED FLASH CHIP WITH ALREADY FILLED OTP!!!