Advanced users can repack a working stock ROM into universal form:
This process requires Linux and kernel compilation knowledge. mt6572 universal firmware
The most common nightmare after flashing universal firmware is "Invalid IMEI" (dial *#06# returns null). Advanced users can repack a working stock ROM
Fix without PC (If rooted):
Fix with PC (Chameleon or SN Writer): Use SN Write Tool for MT6572. Load the database file from your universal firmware. Write the IMEI back. This process requires Linux and kernel compilation knowledge
Sometimes, the universal firmware disables hardware via build.prop. Edit the file (/system/build.prop) and change: