During June 2025, Tobias focused on enhancing cryptographic robustness in the flipperdevices/u-boot repository by addressing a bug in PKCS11 path matching for RSA signing. He implemented a fix in C that augments the existing object label-based matching with object id-based matching, improving compatibility with hardware tokens such as Yubikeys. This change ensures that RSA signing operations succeed even when private and public keys have differing labels, reducing signing failures across platforms. Tobias applied his expertise in cryptography, embedded systems, and PKCS11 standards to deliver a targeted, traceable improvement that strengthens the reliability of hardware-backed cryptographic workflows.