Sin Commandos = No Command. One of the buttons should display the "Android Recovery Menu
1. You say you tried short pressing/tapping all (both press and touch) buttons namely Power, Vol up, Vol Down, Options, Home and Back to no avail - for that reason, we will skip this
2. Try access the Exclamation mark screen and retry all these key respectively, but quickly double tap/press each one intead this time and see if any of them will not display the recovery menu.
3. Also try Volume up followed by the Volume down key (or vice verse) and observe.
Kindly comment back with the results.