[amibroker] 5-second IB intraday data backfill question

[itmwh]

Hi, today I tried to download the Febuary 5-seconds intraday data of 
HSIG7-HKFE-FUT from Interactive Brokers with AB , but found that I can 
only download the 5-second realtime data from Feb.13 AM.  (In database 
setting, I fill in  200,000  as the default number of bars.)   Has some 
one experience the same when downloading 5-second data from IB ?   Is 
it possible to download the whole month 5-second data of a contract  in 
just  one time ?