看來真的是一更新韌體後，快門數跟著也被歸零了，那這個小工具的參考價值就有點爭議了呀，要是在未送回原廠更換新的快門組零件時更新韌體(非官方)，快門數就此歸零，然後再把原先備份的韌體再更新回相機上，那快門數就隨便人掰了嘛....
2010/06/08補充：
再連到原網站看仔細後，哦~這個小工具只能用在Digic III/IV處理器上面，另外有些機型雖然也有使用Digic III/IV處理器，但是Canon原廠把查詢快門數的功能拿掉了，原網站上的FAQ我把它貼到下方。
EOS Info工具網站：astrojargon - EOSInfo
EOS Info下載連結
FAQ:
0) I have a 1D*/5D/10D/20D/30D/40D/50D/300D/350D/400D/450D/500D/1000D. Will EOSInfo work with it?
EOSInfo should work with any Canon DSLR. HOWEVER, see FAQ #1.0
1.0) Will this show the SHUTTER COUNT on my 1D*/5D/10D/20D/30D/40D/50D/300D/350D/400D/450D/500D/1000D?
The shutter count information is available *only* on Canon DIGIC III/IV DSLRs *except* the 1D* series. This means that EOSInfo will display the shutter counter for the 40D, the 50D, the 450D, 500D, and the 1000D. It will also show the shutter counter for the 5DMkII, but the camera must be power-cycled before the value is updated. The shutter counter will not be displayed (or will be displayed as "0") on the 1D*, 5D, 10D, 20D, 30D, 300D, 350D, and 400D. It's not that I have anything against the owners of those cameras, but simply that the Canon SDK does not support retrieving the shutter count for them. UPDATE (08/06/2009): Apparently, Canon has removed the facility for checking the shutter count on the 500D. More news when I learn something.
PS：上面內容中，加底線的500D也是被Canon原廠取消顯示快門數功能的機型。1D*系列的機型也是沒有顯示快門數功能的。
由上面的內容得知，是不是有支援顯示快門數，端看Canon開發的SDK中有沒有這部分的程式碼，所以是某些機型或更新機型上面不再支援顯示快門數，這就有點像是俄國人把300D的韌體中被封印起來的功能破解出來，讓300D能擁有10D機型才有的自定義功能一樣。
