Juan, one possible solution for your volume control issue: please do a long press of the left small button to get to the menu. "Audio" will appear. Do a short press of the same button and "Volume step" will appear. If the step size shown is something very small like 0.25 dB , please change that to 2 dB by again short pressing the left small button, then rotate the right encoder to get to 2 dB, then press the right small button 3 times to get back to the operating screen. Now it takes less rotations of the volume encoder to increase volume.
Also, and before doing the above, if you just updated the firmware, it is sometimes necessary to do a factory reset to clean out anything left in the EEPROM. Did you do that??