Shopify POS firmware: extracting a root hash
An in-scope Shopify POS endpoint exposed the card reader's firmware bundles, which unpack via binwalk, a dd carve at 0x202024 and jffs2dump into a JFFS2 root filesystem containing a salted MD5 root hash.
binwalk
Pointing binwalk at a firmware blob to find out where the filesystem starts.