This could be difficult. Is the hdd broken completely or are you maybe able to take it out of the 2050, attach it to a computer and copy everything to a working hdd which you then put again into the 2050?
In this community I assume no one will give you the file of pan-os 7.1. A very small chance you might have by asking your SE ... or buy a PA-440 which is supported, is more powerful and supports all the current protections of paloalto. As pan-os 7.1 is quite old already there might also be security vulnerabilities that are no longer fixed in this version, so using this firewall might even be a risk than a protection - except maybe for completely separated lab environments.
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