You may need to reinstall the ROM as it sounds like it's messed up. Try this:
Step 1: You need to find the Explorer/Poco RUU that's correct for your phone. An RUU is an executable file that will restore the original ROM to your phone from your computer via USB cable. A list of available RUUs may be found below. Try downloading this one from the list: RUU_Pico_hTC_Asia_India_1.31.720.3_Radio_10.35d.80.09H_1.11.82.17_release_230683_signed.exe.
Directory listing of http://www.htcruu.com/Pico
Step 2: Install
HTC Sync on your Windows computer. It will also install the USB drivers for HTC which your computer needs to recognize the phone.
Step 3: Plug the phone in for an hour to make sure it has adequate battery.
Step 4: Boot the phone into HBOOT (turn it off, pull out and reinsert the battery, hold volume down and press power button). Highlight
FASTBOOT using the volume rocker and press power. Then connect the USB cable. You should see it change to
FASTBOOT USB.
Step 5: Run the RUU in Windows and follow the directions in the wizard. Be careful not to disconnect the USB cable or disrupt the RUU running in Windows until the process is complete.
Also, in the future, make sure you never do a factory reset with low battery, but I'm sure already know that now