Have 2 boost mobile htc evo design 4g, how to copy stck rom from one handset to the other

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http://forums.androidcentral.com – I have two boost mobile htc evo design 4g phones, one in modified stock, the other one I tried to root amd flash with jellybean rom I followed : [GUIDE]How to Root Boost Mobile HTC EVO Design 4G+Install Jelly Bean from xda developer forum, shows us cellular network, Does anyone know how to copy the uprooted stock rom from the untouched phone to the modified phone. Pretty much a newbie and didn't dulled understand how to make a backup image of the phone. Now I want to go back to the original stock phone, then root without applying/ flashing a new rom. Thanks for any help. Don't w (HowTos)