problem with lenovo moto tab modem unlock
i have Lenovo moto tab TB-x704a (s/n HA0UHATB imei 865301030085506) locked to at&t.
official at&t unlocking service replied, that "The manufacturer doesn't have an unlock code for this device" phone help suggested me to ask lenovo for unlock code
i made request to lenovo and received this answer "To unlock, you need to use the service from the official website of the network provider - the manufacturer does not have access and does not provide such codes" - they returned me to at&t...
the question is: how can i unlock my tablet to use with sim