TWRP not booting on Samsung galaxy S3 LTE GT-i9305T

A

AC Question

Hi,

I installed KingRoot to root the device.

Then Flashify to install the customer Recovery image (TWRP) {file name : twrp-3.0.2-1-i9305.img}

The TWRP installation was done successfully and I could even backup my Stock ROM.

The problem is TWRP is not booting when done in Download Mode (press and hold Home + Power + Volume Down buttons.
The default android is getting opened. (A yellow triangle icon with ! mark... Message is : A custom OS can cause critical problems in phone and installed applictaions. Volume up: continue, Volume down: cancel)

Kindly help in resolving the issue so that TWRP gets booted. Else the whole effort of downloading the apps and rooting the phone goes waste.

Regards
Jayson