You can find specific firmware and JSON files for QMK-compatible keyboards on the Keychron Firmware Page .
Second, why avoid unknown firmware links? Unauthorized firmware can contain malware, cause irreversible hardware damage (bricking), or void warranties. Even well-intentioned user-uploaded files may be corrupted or mislabeled. For the “q6x v22,” if no official link exists, consider contacting the vendor directly. Many maintain legacy firmware archives upon request.