I traced AltServer sign-in failures from network traffic to client behavior, showing that Apple ID authentication succeeded before a token request returned a 503 page the client parsed as a plist. I built length-preserving patches for signed macOS and Windows binaries, and independent users confirmed they worked.
On my Sidecar investigation, I traced error −203 to an iPad iCloud Keychain trust state using disassembly, a Swift probe, and device logs. I also contribute security fixes and tests to rizin and radare2, and build backend and Apple-platform projects.
