Posted by Jayce Ooi as How to
If you install custom firmware on Samsung Galaxy S II, a yellow triangle will show up at the bottom of Samsung Galaxy S2 Logo during boot up. How to remove yellow triangle on Samsung Galaxy S2? The simplest way, get yourself a Micro USB Jig. Then use it to put Samsung Galaxy S2 into Odin download mode.
Step by Step Guide
Yellow triangle at Samsung Galaxy S2 boot up screen will be removed after you plug in USB jig. Isn’t that as simple as ABC?