With some luck I found the firmware by myself in my PC I remembered that I use it some time ago, I'm sharing with you, here it is:
DS-7104/08 n/sn/p 3.13 CH to EN firmware
DS-7104/08 n/sn/p 3.07 CH to EN firmware
DS-7104/08 n/sn/p 3.13 CH to EN firmware (mirror)
DS-7104/08 n/sn/p 3.07 CH to EN firmware (mirror)
*all the credits goes to whoslooking.
DS-7104/08 n/sn/p 3.13 CH to EN firmware
DS-7104/08 n/sn/p 3.07 CH to EN firmware
DS-7104/08 n/sn/p 3.13 CH to EN firmware (mirror)
DS-7104/08 n/sn/p 3.07 CH to EN firmware (mirror)
*all the credits goes to whoslooking.