An electronic device, such as a dynamic transaction card having a chip, an applet, and a cryptographic coprocessor performs secure firmware and/or software updates, and performs firmware and/or software validation for firmware and/or software that is stored on the electronic device. Validation may compare a calculated checksum with a checksum stored in the device. If a checksum calculated for a firmware and/or a software application matches a stored checksum, the transaction card may operate normally. If a checksum calculated for a firmware and/or a software application does not match the stored checksum, the transaction card may freeze all capabilities, erase the memory of the transaction card, display data indicative of fraud, and/or the like.