[Q] Set preferred network

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http://forum.xda-developers.com – Hi, on Oxygen ICS Rom, my phone showed "GSM/CDMA auto (PRL)" as preferred network type under Phone info (dial *#*#4636#*#*). Now on Rasbeanjelly (and on JellyBelly as well), it shows "WCDMA preferred" and cannot be changed (actually I CAN change it, but it reverts to WCDMA when I return to the settings screen). Is this related to the ROM? To the radio? To the kernel? Is it possible to change it permanently? Thanks Julian (HowTos)