Ridmik Keyboard 4. 0 is here! Unijoy layout has been removed from this app. Features. 1. Bangla phonetic keyboard (like your favourite Avro keyboard). 2. National & Probat layout. 3. External keyboard support (only Phonetic & English, use F12 to switch). 4. Bangla English word prediction/suggestion for faster writing. 5. 9 themes including Lolipop theme. Installation.