Change carrier back to cricket

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http://forum.xda-developers.com – So while tinkering with my phone, the LG optimus Regard, I bricked it. Then I found a rom for the LG Motion MS-770 witch works with my phone, however after flashing this rom, my phone is now on MetroPCS. I need to know how to get my phone back on cricket (NO ROMS AVALIBLE FOR THE LG OPTIMUS REGARD, ANYWHERE) so how do I hack my carrier back to cricket. Also does anyone know how I can change my Model number back to LW-770 as opposed to MS-770 Thanks in advance, please anyone help me as I am without a phone until someone replies. (HowTos)