What does this mean ?
Do you mean 'buys' as in 'purchase' ? If so, from where ?
Or do you mean 'buys' as in 'apply' and 'European technique' as in 'European firmware' ?
I have seen that on the European website for HIKVISION, the firmware for the DS-7104NI-SN (not the DS-7104N-SN/P) is available, but I've not seen anyone apply it as yet. From what I've seen the ****-SN and ****-SN/P firmwares are interchangeable (according to the last link below).
http://www.hikvisioneurope.com/portal/index.php?dir=Product%20Firmware/Recorder/
Also the Chinese firmware for the DS-7104N-SN/P is available from :
http://www1.hikvision.com/cn/download_more_699.html