Here is a guide on How To unlock your MyPhone My28 lock in Smart provider.
2. Download Firmware.
3. Download SPD Driver and install it.
4. Open UPGRADEDOWNLOAD_R2.9.9015 folder. Open Bin folder and look for UpgradeDownload. Double click to open the software.
5. From the software, click Load Packet. Browse the firmware or the PAC file named MyPhone My28_Smartlock(OPENLINE) by Team28DEVS.
6. Press start downloading.
7. Power off the phone. Press volume down and insert the usb cable(note: all drivers must be installed, or else the program will not run)
8. Wait until finish.
9. Finally take out the battery, and reinsert. Power on the phone. Wait for a few minutes.
10. SMILE.
credits to: Team28DEVS