OTA caused a boot loop?

My boot loader is unlocked and am rooted with the stock recovery. My model is XT1550 (dual sim variant in India). I received the OTA updates today.. I downloaded them and installed.. The installation looked like it went fine.. after the installation the phone restarted.. but it kind of went to a boot loop after that.. I can power off the phone pressing the power button for some time.. bu the phone powers off and restarts automatically... it does not progress beyond the few initial screens after which it just displays a blank display...

I am able to get into flashmode.. however, my pc does not recognize the device.. adb terminal shows no devices when I give "adb devices" command.. can someone help? Can I do a factory reset from the flashboot menu? what does the factory mode do? what else can be done to salvage the situation? Thanks.