If you are using newest RUT955 Firmware, it is possible to choose band manually. This option can be would Network -> Mobile -> Network Frequency Bands. Choose manual mode and select band you want and press "Save". This function was added in RUT9XX_R_00.05.03.3 firmware.
P.S. This function works only with these product codes: RUT9xx H*****, U***** and T*****. You can check your product code here: Status -> Device -> Product code. This