REG:Maximum mtu size in nrf52840 s140 sodt device

i am currently using nrf52840 dk as a hardware, nrf5sdk version 17.1.0 ,ble_app_uart peripheral example (s140 soft device )

here the maxmimum mtu is set to 247 bytes whether there is possibility to change the mtu 263 that 263-opcode length-handle length. if that is possible how to do . whether any other soft devices of this sdk has higher mtu size than this . or any other sdk next verison is available with higher mtu size . note i am using segger embedded studio ide  

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