Your device chipset is called MT6572, perhaps searching from the chipset name may help you.
Maybe SN Write tool can solve your problem. It looks like you first have to root your phone then write your IMEI using the right databases in SN WRITE TOOL.
There is also this:
SIGMA KEY
Yoda Method of Unlock/Get Unlock Codes:
works with the following devices:
almost all Android smartphones of different brands based on MT6516 / MT6571 / MT6572 / MT6573 / MT6575 / MT6577 / MT6580 / MT6581 / MT6582 / MT6589 / MT6592 / MT6595 / MT6732 / MT6735 / MT6752 / MT6753 / MT6795 / MT8312 / MT8321 / MT8377 / MT8382 / MT8389 chips;
smartphones that can't be unlocked neither with generic unlocking method, nor with unlocking by IMEI;
smartphones with blocked counter of code entries attempts / disabled unlock codes entry fields;
smartphones that get locked again after master reset operation has been completed;
MTK smartphones, solving lots of unlock issues.
Simplified unlock procedure allows to avoid issues with phone connection and searching / installing drivers for every particular new brand.
Support for MTK-based smartphones that report fake processor model.
A smartphone can be based on a Mediatek processor, which is being indicated as a chip of another vendor in phone menu / the software reads wrong information about a chip.
Yoda Method of IMEI Repair
IMEI Repair solution:
Works with almost all (99.9%) Android smartphones of different brands based on MT65XX / MT83XX chips.
Unlike any existing solution, allows to repair Hardware and Software IMEI.
Repairs "Invalid IMEI", "IMEI: 0" issues.
Simplified repair procedure allows to avoid the most common issues with phone connection and searching / installing drivers for every particular new brand.
IMEI stays repaired even after MASTER Reset operation has been completed.
Root Solution for Supported Android Smartphones:
Various Android versions supported for root/unroot
Read Codes/Unlock:
Direct Unlock:
Android smartphones based on MTK CPU supported
Alcatel, Motorola, ZTE and other MTK brands
Huawei with old and new security types
There is no need to select model from the list
Standalone solution, doesn't need any server codes or credits
All firmware versions and provider IDs are supported
Fast unlock procedure
Read User Code (unlike using "format FFS", no private information will be lost)
Read/generate all types of codes:
Motorola EX-series, Huawei, Android smartphones etc.:
NP (Network Personalization) code
NSP (Network Subset Personalization) code
CP (Corporate Personalization) code
SP (Service Provider Personalization) code
SIMP (SIM Personalization) code
NS-SP personalization code
SIM-C personalization code
Alcatel, Motorola WX-series:
NCK (Network Control Key) code
NSCK (Network Subset Control Key) code
SPCK (Service Provider Control Key) code
CCK (Corporate Control Key) code
PCK (Personalization Control Key) code
Support of specific firmware and hardware versions:
Models locked with "hardware lock"
Models with auto SP-lock
Models with more than one SIM
Models with disabled unlock code menu
Unlock Code Calculation by IMEI:
Supported models: Alcatel / Motorola / Orange / TCL / Vodafone / T-Mobile / TMN / ZTE
Internet connection is not required for code calculation
Standalone solution, doesn't require server codes or credits
No limit for quantity of codes calculated per day
Flash/Backup:
SigmaKey flash files are stored in *.skf format
Read phone's firmware version
COM port speed – up to 921600 bps
Read & Restore backup
Upgrade firmware (restore backup from one phone into another)
Upgrade and downgrade firmware version
Huge flash files archive:
Latest firmware versions
Huge archive of operator's firmwares
Huge selection of language packs
File names specifications:
"Locked" – means that after firmware update phone will be locked
"ID Flash" – means that firmware is intended for a specific flash memory type
"LP description" – means that each file contains description of languages that are placed in the flash file
Correct firmware upgrade for Alcatel models (works with CUST PARA area)
Smart (fast) write mode
Simple write mode
Works with NAND and NOR flash chip type:
Same flash file can be flashed into NAND chips with different page sizes
Complete handling of NAND bit errors
"Bad blocks" detection and marking during flashing process for phones with NAND chip
IMEI:
Repair IMEI, including models with more than one SIM
Repair Software IMEI (phones with IMEI located in file system)
Repair Hardware IMEI (phones with IMEI located in OTP area flash chip)
Repair IMEI for Huawei models with new security type
Repair Blank IMEI
Repair Security Area:
Repair Security Area for Alcatel cell phones (flashing method)
Diagnostics and Security Area Repair for Huawei cell phones (models with new security type).
Repair of the following software errors:
Software Error 23
Software Error 4
Software Error 3
Software Error 20
Other types of software errors
Work with Phone's File System:
Works with FFS through boot mode (allows to export information from the phone's FFS zone even if the handset is dead, but file system of the set is not damaged)
Works with network calibrations (backup and restore)
Works with phone's flex (backup and restore)
Phone book backup
Format file system
Work with Phone's File System:
Works with FFS through boot mode (allows to export information from the phone's FFS zone even if the handset is dead, but file system of the set is not damaged)
Works with network calibrations (backup and restore)
Works with phone's flex (backup and restore)
Phone book backup
Format file system
Supported CPUs:
MediaTek MT6219, MT6223, MT6225, MT6226, MT6235, MT6236, MT6238, MT6239, MT6250, MT6251, MT6252, MT6253, MT625A, MT6260, MT6261, MT6268, MT6516, MT6572, MT6573, MT6575, MT6577, MT6582, MT6589, MT6595
Support for new CPUs and flash chips are being added immediately
Other Options
Works via UART interface – any virtual or physical COM-port (up to 921600 bps)
Phone's external RAM testing
Accelerating operations execution (boost mode)
MTK boot speed autodetect
DTR & RTS serial port control
Multilingual software interface: English, Russian, Ukrainian, Spanish, Portuguese
Source: sigmakey.com/en/Sigma-Overview/MTK.html
I'm having a GPS issue with this same device, if someone can help me, please check my post:
chinaphonearena.com/forum/Thread-Mtk-6572-Doogee-DG300-GPS-not-working-Even-with-EPO-and-AGPS-possible-solution
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