For base setup if all connectivity is lost you need to access via Serial Console (115200 Baud) using the cabling delivered with the hardware or compatible solutions.
See https://www.ibm.com/docs/en/datapower-gateways/10.0.x?topic=configuration-1-3-connecting-serial-cable-appliance
For reset, do you mean physical powercycling or do you mean the "reinitialize" firmware command (clean reinstall)?
For management port, do you mean access to Serial Console or SSH or WebMgmt? Depending on reply the answer may vary.
There is no exact advanced IMM2 in DataPower as in other xSeries servers, but DataPower does support IPMI protocol if configured. Unfortunately, if you mess up its configuration in firmware you can still loose access, then needing serial console again.
- https://www.ibm.com/docs/en/datapower-gateways/10.0.x?topic=access-serial-over-lan
- http://www.orangespecs.com/datapower-ipmi/
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