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CC3100: Can I change country code without flash memory soldered?

Part Number: CC3100

Hello! I work with CC3100 (SDK ver.1.2.0) in STA mode without flash memory. I don't need to change MAC or store profiles, so flash is not needed: chip works good for me without it. However, today I've encountered a problem: my CC3100 cannot see wifi channels 12 and 13. These channels are allowed in my country, so it is necessary for us to use them. I tried to change default US country code to EU by calling sl_WlanSet before an attempt to connect, but unsuccessfully. sl_WlanSet returns no error, but chip still cannot scan and connect to WLANs sitting on 12 and 13 channel. I suspect that flash chip is needed to store and use new country code. Am I right? Is there another way to change country code?

Best regards, Michael.