Boot into Maintenace Mode and do a Factory Reset.
This will delete much more than "request system private-data-reset"
including old PanOS / App / Threat Version
and possible big Log Files with unsuccessful Login attempts.
Most of the time , this way will be the fastest to get the Device running.
Else you can open a support Case and go to root shell
to find the big Files.
My colleague actually encounter similar problem, she was upgrading from 7.0.1 to 7.1.19 issue was with getting 7.1 base version onto pa200 using GUI, operation end-up with " upload file size exceeded system limit "
Use the CLI (tftp/scp) to upload the 7.1.0 image to the firewall and then proceed with the upgrade as usual.
It was tested on couple pa200s and solved the problem, apparently this is known bug in 7.0.x.
Hope that helps someone.
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