TCP Server Works in Transparent Access Mode

we designed a board using an EG91-E module. We want to add communication options to our applications. We did TCP Client in Transparent mode. But we couldn’t get it working as TCP Server in Transparent mode. When i try to send below command i get an ERROR message
AT+QIOPEN=1,1,“TCP LISTENER”,“”,0,3500,2
but if i send
AT+QIOPEN=1,1,“TCP LISTENER”,“”,0,3500,0
it works ok in buffer access mode.
We also designed a board using M95FA module and we used all the communication options on that module. We have been using it last couple of years. We may even sold couple of thousands devices with M95FA. We need to get EG91 module working. Looking for some advices.
Thanks in advance.

Dear Sir,
Thanks for your inquiry.
Sorry about that EG91E module do not support transparent access mode when module work as TCP server. Thanks!