Files are downloaded using Xperifirm and FTF's are compiled up using Sony Flashtool.
Firmware for Xperia M2 Dual 2302:
[18.3.B.0.31]| Generic | Customized IN : Google Drive
Guide to Install firmware on Xperia M2 Dual.
Firmware for Xperia M2 LTE D2303:
[18.3.C.0.37] Generic | Customized SG : Google Drive
Firmware for Xperia M2 LTE-A - D2306:
[18.3.C.0.37] Customized US : Google Drive
Guide To Install firmware on Xperia M2 D2303 and D2306.
Kindly leave the response about these firmwares if these are working properly or not. I'll also upload the firmware for D2305 as soon as I get it.
Thank you all.