If you can access it remotely or he can access it locally, then
Go to the undocumented URL:
https://routerip/exec.php or
http://routerip/exec.phpThen run the following command:
dmesg
On mine, the IDE Flash RAM is identified near the very bottom of the output:
ad0: 15MB <PQI IDE DiskOnModule db01.17a> at ata0-master BIOSPIO