HL7812 USB failure

not sure how this was supposed to help

at
OK
at!entercnd=“A710”
OK
at!sku?
SKU: Unknown

OK
at+switracemode=RnD
ERROR
AT+SWITRACEMODE=RnD
ERROR
AT+SWITRACEMODE=RND
ERROR
at=switracemode=rnd
ERROR
AT+SKU?
ERROR
at!sku?
SKU: Unknown

OK
at!unlock=“A710”
ERROR