A team of researchers demonstrated that cryptocurrency wallets Trezor and Ledger are vulnerable to several type of attacks. The group of researchers presented called wattet.fail firmware, side-channel, microcontroller and supply-chain attacks that impact most popular hardware-based cryptocurrency wallets. The experts demonstrated how to tamper with the packaging of a cryptocurrency wallet, They removed the anti-tampering holographic seal using a hair drier and replaced the microcontroller with their own chip with a customized bootloader.”]
Source: https://securityaffairs.co/wordpress/79367/hacking/cryptocurrency-wallets-hack.html