The slowdown caused analysts to downgrade Apple's stock. Some departments may use the terms "upgrade" and "downgrade" as well. Stock markets worldwide and the euro currency declined in response to the downgrade. Japan also saw a rating downgrade the following year due to debt burden. A downgrade below that meant forced asset sales and further devaluation. There were fears that calling the election could trigger another credit downgrade. International reaction to the US credit rating downgrade has been mixed. The operating system installed is Windows 7 32-bit/64-bit with a XP downgrade as an option. S&P claims that this action is retaliation for its 2011 downgrade of United States debt. Once updated it is impossible to downgrade. Removing backward compatibility is often the only way to prevent downgrade attacks. At this point, the locomotive will essentially cease to accelerate, unless on a downgrade. The term downgrade may be used in the opposite situation. Lacking sufficient braking power for the steep downgrade of 3.3%, the train derailed. This is one of the most common types of downgrade attacks.