[NEED HELP] Looking for a guide to flash a GB ROM
A friend of mine has an Optimus 2X that she got from her university. She has to develop an unity app which works with 2.3 APIs so she needs a Ginger Bread ROM to use these APIs. Since she has a Nexus 4, she already has the newest JB version to test the app on newer devices. This is why she explicitly wants a Gingerbread ROM, and nothing newer. Could anyone give a guide on how to install a Gingerbread ROM and which of them is the best for this purpose?
Information about the current installed version:
Model number: LG-P990
Android version: 2.2.2
Baseband version: 1035.21_20110218
Kernel version: 184.108.40.206-dirty
Build number: FRG83G
LGE Version LGP990-V10b
Thanks in advance, any help is appreciated!
Since the phone belongs to the university, she cannot unlock the bootloader. Also, the software update within Android itself says that there is no new version available. Is it still possible for her to upgrade to a GB ROM, maybe even a stock one?