If you wish to brick your phone - yes.
Otherwise - no.
EDIT: On a serious side - it is highly likely that you will brick your phone (or lose most of its functionality). Better not try that. Custom ROMs is fine, as they only change system partition, however stock firmwares include kernel, recovery, modem etc also.
Current devices: Samsung Galaxy Note 3 (N9005), Sony Ericsson Xperia Arc S
Android is a Linux-based operating system, but this fact doesn’t put … more
21 Sep 2014
By Tomek Kondrat
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?