The Xbox One version (and the backward compatible version played on Series X|S) is significantly more secure. The save files are encrypted and tied strictly to the user's Xbox Live profile.
This is where save editing is most common. The Xbox 360 security architecture is older and has been widely exploited by the modding community. "Full" save editors exist for the Xbox 360 version, but using them usually requires: forza horizon 2 save editor full
Instead of editing your own save, many players look for "100% Completed" save files online. These are files uploaded by other players who have already unlocked everything. By downloading this file and replacing your own (again, requiring tools like Horizon for Xbox 360), you can instantly access all cars and completed events. The Xbox One version (and the backward compatible
This is generally considered safer than manually editing values in a hex editor, as the file has already been tested by the original player. Avoid: YouTube descriptions with bit
I won't link to direct downloads, because 99% of "FH2 Save Editor Full.exe" files contain keyloggers or ransomware. Instead, search these trusted sources:
Avoid: YouTube descriptions with bit.ly links. Those are almost always malware.