iTuneDVR

Does anyone know the meaning of the letters B, C, T etc on the hinge and the camera, because when I look for a firmware for somebody my model comes out, for example, for the Chinese model DS-2CD3310D / three firmware depending on the letter of the package or the camera / has a firmware that does not have a specific letter.
How can I find out which firmware is for my DS-2CD3310D camera if the camera label is deleted or no have, since it has been installed for a long time?
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Possible it's R2 and E1 series.
In Russia it's have common name HiWatch series.
Wrong firmware don't update your ipc!

In download sectiom for firmware herehttp://www1.hikvision.com/cn/download_more_714.html#prettyPhoto have three firmwares one for platform E2 and two for R2,I only know my camera is dome camera DS-2CD3310D-I

DS-2CD3310(D)-I - is R2 series

E0 - is for CN
E1 - is for Europe

ok, but for R2 there are two firmwares - one for camera with letter "B" in the label camera /what means this letter "B" / and one firmware without any letters - clear.
I dont know my camera of which type is have a letter /in case "B"/ or no have letter because it has been installed for a long time and has no label in the moment.
p.s: what is the meaning of these letters /"B", "C", "T" and etc / on the label and depend choice right firmware

R2 have one firmware!