Owners of the £99 Tesco Hudl tablet should think twice before selling it on, after tests showed personal data remains on the device even in the event of a factory reset.
Munro found he was able use a simple piece of software to view retrieve personal data like photos, browsing history web cookies, Wi-Fi keys and the pin codes used to unlock the Hudl.
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The data could even be used to log in to websites and pose as the previous owner.
Munro says the flaw is due to a known about bug within the Hudl's Rockchip processor.
In response, Tesco advised all customers to use a data wiping app before bestowing the tablet on another owner, and said devices returned to the store would be wiped.
A Tesco spokesperson said: "Customers should always ensure all personal information is removed prior to giving away or selling any mobile device. To guarantee this, customers should use a data wipe program."